Mukhtasar Bukhari

Narrated by Sayyiduna Abu Huraira (may Allah be pleased with him) from the Prophet Muhammad (peace and blessings be upon him) that he (peace be upon him) said: "We have come after the previous nations, but on the Day of Resurrection we will be foremost." And the Messenger of Allah (peace and blessings be upon him) said: "By Allah! If any of you insists on his oath regarding his family, then the sin of this insistence in the sight of Allah is greater than the sin of the expiation that has been made obligatory upon him."