Genesis 31:48

48 And Laban said to Jacob, Behold this heap, and the pillar, which I have set between me and thee; this heap witnesses, and this pillar witnesses; therefore its name was called, the Heap witnesses.

Genesis 31:48 In-Context

46 And Jacob said to his brethren, Gather stones; and they gathered stones and made a heap, and ate there upon the heap; and Laban said to him, This heap witnesses between me and thee to-day.
47 And Laban called it, the Heap of Testimony; and Jacob called it, the Witness Heap.
48 And Laban said to Jacob, Behold this heap, and the pillar, which I have set between me and thee; this heap witnesses, and this pillar witnesses; therefore its name was called, the Heap witnesses.
49 And the vision of which he said—Let God look to it between me and thee, because we are about to depart from each other, —
50 If thou shalt humble my daughters, if thou shouldest take wives in addition to my daughters, see, there is no one with us looking on. God witness between me and thee.

The Brenton translation of the Septuagint is in the public domain.