﴿ وَأَنذِرْ عَشِيرَتَكَ ٱلْأَقْرَبِينَ ﴾

“And warn [whomever thou canst reach, beginning with] thy kinsfolk,”

And warn the nearest of your kinsfolk namely the Banū Hāshim and the Banū al-Muttalib ‘He the Prophet warned them publicly …’ as reported by al-Bukhārī and Muslim.