Strong H5087 נָדַר nâdar · to vow

Genesis

1. Genesis 28:20
   And Jacob vowed a vow, saying, If God will be with me, and will keep me in this way that I go, and will give me bread to eat, and raiment to put on,
2. Genesis 31:13
   I am the God of Beth–el, where thou anointedst the pillar, and where thou vowedst a vow unto me: now arise, get thee out from this land, and return unto the land of thy kindred.