TN Gen25:33 :וזבין ית בכורתיה ליעקב‏ : so he sold his primogeniture to Joseph
See the entire entry for bkwrh n.f. birthright, primogeniture

TN Gen25:33 :ואמר יעקב אשתבע לי כיומא הדין ואשתבע לי׳‏ : Jacob said "swear it to me today" and he swore to him
See the entire entry for šbˁ vb. C to swear