The blood of my sacrifice - That is, the paschal lamb. See Clarke on Exodus 23:18; (note).
The precepts contained in these verses are, for the most part, identical in substance with some of those which follow the Ten Commandments and are recorded in “the Book of the covenant” (Exodus 24:7).
Exodus 34:13
Cut down their groves - This is the first reference to what is commonly known as grove-worship. The original word for “grove” in this connection אשׁרה 'ăshêrāh is different from that so rendered in Genesis 21:33. Our translators supposed that what the law commands is the destruction of groves dedicated to the worship of false deities Judges 6:25; 2 Kings 18:4; but inasmuch as the worship of asherah is found associated with that of Astarte, or Ashtoreth Judges 2:13; Judges 10:6; 1 Samuel 7:4, it seems probable that while Astarte was the personal name of the goddess, the asherah was a symbol of her, probably in some one of her characters, made in wood in some conventional form.
Exodus 34:15-16
An expansion of Exodus 34:12. The unfaithfulness of the nation to its covenant with Yahweh is here for the first time spoken of as a breach of the marriage bond. The metaphor is, in any case, a natural one, but it seems to gain point, if we suppose it to convey an allusion to the abominations connected with pagan worship, such as are spoken of in Numbers 25:1-3.
Exodus 34:21
See Exodus 20:9; Exodus 23:12. There is here added to the commandment a particular caution respecting those times of year when the land calls for most labor. The old verb “to ear” (i. e. to plow) is genuine English.
Exodus 34:24
Neither shall any man desire etc. - Intended to encourage such as might fear the consequences of obeying the divine law in attending to their religious duties. Compare Proverbs 16:7.