وَعَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ ”كُلُّ مَوْلُودٍ يُولَدُ عَلَى الْفِطْرَةِ حَتَّى يُعْرِبَ عَنْهُ لِسَانُهُ فَإِذَا أَعْرَبَ عَنْهُ لِسَانُهُ إِمَّا شَاكِرًا وَإِمَّا كَفُورًا“
It is narrated from Sayyiduna Jabir bin Abdullah, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: Every child is born upon the fitrah, that is, the religion of Islam, until his tongue begins to express on his behalf, and when this happens, then it becomes clear whether he is a grateful Muslim or an ungrateful disbeliever.