GEN1399 We are obligated to accompany people who leave our house.   The Daas Zkainim explains the reason for the prohibition against eating the thigh-vein in the following manner: The night before Yaakov’s confrontation with Aisav, Yaakov was left by himself.   He was attacked and in the ensuing struggle Yaakov was wounded in the thigh. Yaakov’s children behaved inconsiderately in leaving their father by himself; they should have remained with him.   Therefore the Almighty imposed upon Yaakov’s descendants a prohibition against eating the thigh muscle in order to insure that they would remember to accompany others.   When someone leaves our house, we are obligated to accompany him at least four amos (app. 8 feet) SMA, Choshen Mispot 427:11.   We must show the visitor the way and wan him of any pitfalls. Ahavas Chesed, part 3, ch. 2.   PLYN 107