Muhammad [pbuh] . The wise man understood that all of these unequivocally smacked of a serious plot being hatched to disregard his status as a custodian of the Prophet [pbuh] , and kill the latter publicly. In the event of such a thing, Abu Talib deeply believed, neither ‘Umar nor Hamzah would be of any avail, socially powerful though they were. [Ibn Hisham 1/269; Mukhtasar Seerat Ar-Rasool p.106]
Abu Talib was right. The polytheists had laid a carefully-studied plan to kill the Prophet [pbuh] , and banded together to put their plan into effect. He, therefore, assembled his kinsfolk of Bani Hashim and Bani Al-Muttalib, sons of ‘Abd Munaf and exhorted them to immunize and defend his nephew. All of them, whether believers or disbelievers, responded positively except his brother Abu Lahab, who sided with the idolaters.