Reference for Genesis 31:53

אֱלֹהֵ֨י אַבְרָהָ֜ם וֵֽאלֹהֵ֤י נָחוֹר֙ יִשְׁפְּט֣וּ בֵינֵ֔ינוּ אֱלֹהֵ֖י אֲבִיהֶ֑ם וַיִּשָּׁבַ֣ע יַעֲקֹ֔ב בְּפַ֖חַד אָבִ֥יו יִצְחָֽק׃

The God of Abraham, and the God of Nahor, the God of their father, judge betwixt us.’ And Jacob swore by the Fear of his father Isaac.