Ibrahim's Declaration of Tawhid Here

Allah tells us about His servant, Messenger and close Friend, the leader of the monotheists and the father of all subsequent Prophets, from whom Quraysh were descended and claimed to have taken their religion. He disowned his father's and his people's worship of idols and said:

وَإِذْ قَالَ إِبْرَهِيمُ لاًّبِيهِ وَقَوْمِهِ إِنَّنِى بَرَآءٌ مِّمَّا تَعْبُدُونَ - إِلاَّ الَّذِى فَطَرَنِى فَإِنَّهُ سَيَهْدِينِ وَجَعَلَهَا كَلِمَةً بَـقِيَةً فِى عَقِبِهِ

Commentary

وَإِذْ قَالَ إِبْرَ‌اهِيمُ (And [ recall ] when Ibrahim said to his father and to his people, 43:26) At the end of the previous verses, Allah Ta’ ala had stated that the 'mushrikin' (polytheists) of Arabia had no argument in favour of their 'shirk' (polytheism) except that they were carrying on the customs of their forefathers. Obviously, sticking to such customs against logical and historical arguments is far from truth and justice. Now the point made in the present verses is that, even if they are adamant on following their ancestors, why do they not follow Sayyidna Ibrahim (علیہ السلام) who is the most noble of their ancestors, and it is taken by themselves as a matter of pride to be among his offspring. He was not only a believer in 'tauhid' (Oneness of Allah) who emphatically directed all his children to remain adherent to this belief, but his life-long behavior also indicates that following forefathers against logical and historical proofs is not permissible. When he was ordained prophethood in the world, all his people were polytheists in pursuit of the customs of their forefathers, but he, instead of blindly following his forefathers, announced his dissociation from his people, according to the dictates of positive proofs; hence his declaration: إِنَّنِي بَرَ‌اءٌ مِّمَّا تَعْبُدُونَ "I disown that which you worship" (43:26).