[If] someone is prohibited by a neder to benefit from another, and he has nothing to eat, [the other person] may give it to someone else as a gift, and he is permitted it.  It happened that a person in Beis Choron, whose father was prohibited by a neder to benefit from him, was marrying off his son. He said to another: “[The] courtyard and banquet are given to you as a gift, but are yours only so that Father can come and eat with us at the banquet.” He replied: “If they are mine, then they are dedicated to Heaven.” He said: “I did not give [you] what was mine in order for you to dedicate it to Heaven.” He replied: “You gave me yours only so that you and your father could eat and drink and appease each other, and the sin should be on my head.” When the matter came before the Sages, they said: Any gift which is not [sincere] —- which, if sanctified, is not sacred —- is not a gift.