Matthew Poole and continuators on Genesis 31:54

54 Then Jacob offered sacrifice upon the mount, and called his brethren to eat bread, and they did eat bread, and tarried all night in the mount.

Either to give God thanks for the great mercies and deliverances vouchsased to him, or to beg Gods blessing upon the present treaty and upon their whole family. But it is not so probable that Iacob would chuse that time for the offering of Sacrifices when Laban was present, whom he could neither honestly admit to them, nor conveniently exclude from them. And therefore seeing the same Hebrew word signifies killing as well as sacrificing, as appears from Numb. 22. 40. 1 Sam. 28. 24. 1 King. 1. 9. 2 Chron. 18. 2. &c. I rather understand it of his killing of beasts in order to a Feast, which he made for his brethren, whom he called, as it here follows, to eat bread, &c. under which phrase all meats are usually comprehended in Scripture, as hath been already noted, and will appear hereafter. And this practise was usual in those times to confirm Covenants by a Feast. See Gen. 26. 30.

Marginal references: Or, killed beasts.