It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that he said: "Whoever wishes, I will do Mubahala with him at the Hajar Aswad that Allah, the Mighty and Majestic, has not mentioned grandfather and grandmother in the Qur'an, rather He has called all of them 'fathers' (ābā’).”Then he recited this verse: ﴿وَاتَّبَعْتُ مِلَّةَ آبَائِي إِبْرَاهِيمَ وَإِسْحَاقَ وَيَعْقُوبَ﴾“And I have followed the religion of my fathers, Abraham, Isaac, and Jacob.”