رَبِّ أَرِنِي كَيْفَ تُحْيِي الْمَوْتَىٰ قَالَ أَوَلَمْ تُؤْمِنْ قَالَ بَلَىٰ وَلَٰكِنْ لِيَطْمَئِنَّ قَلْبِي
My Lord, show me how You give life to the dead. He said: Do you not believe? He said: Yes, but so that my heart may be reassured. (Qur'an 2:260)
The verse mentions both faith already present and a request for further reassurance. It prompts debate about whether this is tranquility added after basic assent or a further degree within certainty.
Abraham did not deny resurrection. The request concerned witnessing how the dead are brought to life. Treating the verse as an admission of unbelief ignores that distinction.