Matthew Poole and continuators on Genesis 31:50

50 If thou shalt afflict my daughters, or if thou shalt take other wives beside my daughters , no man is with us ; See, God is witness betwixt me and thee.

The curse is here understood, as it commonly is, to maintain a greater reverence for Oaths, and to beget a greater dread of the curse belonging to the violators of it.

(i. e.) Here is now no man with us, who, when we are parted, can witness and judge between us and punish the Transgressour. Or thus, Though now we have many with us, as witnesses of this agreement, yet shortly when we shall be parted, no man will be with us, to observe and report our actions to the other, or to do the injur'd person right.