Exodus 23:18

Thou shalt not offer the blood of my sacrifice— It has been concluded, from ch. Exodus 34:25 that the blood of the sacrifice here meant, was that of the paschal lamb; and accordingly the Chaldee paraphrast, in that place, renders it, thou shalt not offer the blood of my passover with leaven (see ch. Exodus 12:15.): and from the next clause in this verse, one would conclude that the passover was meant; concerning which, in the 10th verse of the 12th chapter, it is enjoined, that nothing of it be left remaining until the morning. See Leviticus 3:15; Leviticus 3:17. The passover is called my sacrifice, by way of eminence.