Exodus, Chapter 24, verses 3-8
3 The people promise obedience, 4 Moses buildeth an altar, and twelve pillars, 6 He sprinkleth the blood of the covenant13
13:24 He proposed another parable - in which he farther explains the case of unfruitful hearers. The kingdom of heaven (as has been observed before) sometimes signifies eternal glory: sometimes the way to it, inward religion; sometimes, as here, the Gospel dispensation: the phrase is likewise used for a person or thing relating to any one of those: so in this place it means, Christ preaching the Gospel, who is like a man sowing good seed - The expression, is like, both here and in several other places, only means, that the thing spoken of may be illustrated by the following similitude. Who sowed good seed in his field - God sowed nothing but good in his whole creation. Christ sowed only the good seed of truth in his Church.
13:25 But while men slept - They ought to have watched: the Lord of the field sleepeth not. His enemy came and sowed darnel - This is very like wheat, and commonly grows among wheat rather than among other grain: but tares or vetches are of the pulse kind, and bear no resemblance to wheat.
13:26 When the blade was sprung up, then appeared the darnel - It was not discerned before: it seldom appears, as soon as the good seed is sown: all at first appears to be peace, and love, and joy.
13:27 Didst not thou sow good seed in thy field? Whence then hath it darnel? - Not from the parent of good. Even the heathen could say, "No evil can from thee proceed: 'Tis only suffer'd, not decreed: As darkness is not from the sun, Nor mount the shades, till he is gone."
13:28 He said, An enemy hath done this - A plain answer to the great question concerning the origin of evil. God made men (as he did angels) intelligent creatures, and consequently free either to choose good or evil: but he implanted no evil in the human soul: An enemy (with man's concurrence) hath done this. Darnel, in the Church, is properly outside Christians, such ashave the form of godliness, without the power. Open sinners, such as have neither the form nor the power, are not so properly darnel, as thistles and brambles: these ought to be rooted up without delay, and not suffered in the Christian community.Whereas should fallible men attempt to gather up the darnel, they would often root up the wheat with them.

24 Moses as mediator between God and Israel, having received divers laws and ordinances from God in the foregoing chapters, in this chapter,
writes the laws, and reads them to the people, who repeat their consent, Exo 24:4-7.
and then by sacrifice, and the sprinkling of blood ratifies the covenant between them and God, Exo 24:5-6, Exo 24:8
He did so with seventy of the elders, to whom God made a discovery of his glory, Exo 24:9-11.
Moses is ordered up into the mount, Exo 24:12-13.
the rest are ordered down to the people, Exo 24:14.
The cloud of glory is seen by all the people on the top of mount Sinai, Exo 24:15-17.
and Moses is there with God forty days and forty nights, Exo 24:18.
24:3 Moses told the people all the words of the Lord - He laid before them all the precepts, in the foregoing chapters, and put it to them, whether they were willing to submit to these laws or no? And all the people answered, All the words which the Lord hath said we will do - They had before consented in general to be under God's government; here they consent in particular to these laws now given.
24:4 And Moses wrote the words of the Lord - That there might be no mistake; as God dictated them on the mount, where, it is highly probable, God taught him the use of letters. These Moses taught the Israelites, from whom they afterwards travelled to Greece and other nations. As soon as God had separated to himself a peculiar people, he governed them by a written word, as he has done ever since, and will do while the world stands. Pillars according to the number of the tribes - These were to represent the people, the other party to the covenant; and we may suppose they were set up over against the altar, and that Moses as mediator passed to and fro between them. Probably each tribe set up and knew its own pillar, and their elders stood by it. He then appointed sacrifices to be offered upon the altar.
24:6 1. The blood of the sacrifice which the people offered was (part of it) sprinkled upon the altar, which signified the people'sdedicating themselves to God, and his honour. In the blood of the sacrifices, all the Israelites were presented unto God as living sacrifices, Rom 12:1. 2. The blood of the sacrifice which God had owned and accepted was (the remainder of it) sprinkled, either upon the people themselves, orupon the pillars that represented them, which signified God's conferring his favour upon them, and all the fruits of that favour, and his giving them all the gifts they could desire from a God reconciled to them, and in covenant with them. This part of the ceremony was thus explained, Behold the blood of the covenant; see here how God sealed to you to be a God, and you seal to be to him a people; his promises to you, and yours to him, are yea and amen. Thus our Lord Jesus, the Mediator of the new covenant (of whom Moses was a type) having offered up himself a sacrifice upon the cross, that his blood might be indeed the blood of the covenant, sprinkled it upon the altar in his intercession (Heb 9:12,) and sprinkles it upon his church by his word andordinances, and the influences and operations of the Spirit of promise by whom we are sealed.