(ל) וַיֹּ֕אמֶר כִּ֚י אֶת־שֶׁ֣בַע כְּבָשֹׂ֔ת תִּקַּ֖ח מִיָּדִ֑י בַּעֲבוּר֙ תִּֽהְיֶה־לִּ֣י לְעֵדָ֔ה כִּ֥י חָפַ֖רְתִּי אֶת־הַבְּאֵ֥ר הַזֹּֽאת׃
(30) He replied, “You are to accept these seven ewes from me as proof that I dug this well.”
עברית
http://www.annafineart.com/portfolio/seven-wells-seven-oaths-beer-sheva-rosh-hashanah/
This passage is illustrated with seven sheep and a well for each sheep. Sheva means ‘seven’ and it means ‘oath’, this passage is the connection between those two meanings of the word. The sheep are the sacrifice to seal the oath and the well is the proof that the land can be used by Avraham and his descendants.