Abu Rafi' said that Sa'd offered him
four hundred Mithqal of gold for a house. Abu Rafi ' said, "If I had
not heard Allah's Messenger (ﷺ) saying, 'A neighbor has more right to be
taken care of by his neighbor,' then I would not have given it to
you." Some people said, "If one has bought a portion of a house and
wants to cancel the right of preemption, he may give it as a present
to his little son and he will not be obliged to take an oath."
Sahih al-Bukhari Book 90, Hadith 25