"The Messenger of Allah said: 'O Banu 'Abd Manaf! Buy your souls from your Lord. I cannot avail you anything before Allah. Abu Banu 'Abdul-Muttalib! Buy your souls from your Lord. I cannot avail you anything before Allah. But between me and you there are ties of kinship which I will uphold.'"
Sunan an-Nasa'i Book 30, Hadith 35