Narrated Zuhair:

"Qabus bin Abi Zabyan narrated to us, that his father narrated to him, he said: 'We said to Ibn 'Abbas: "What is the meaning of the saying of Allah the Mighty and Sublime: Allah has not made for any man two hears inside his body.? (33:4)" He said: "The Prophet of Allah ﷺ stood one day for Salat, then he was unsure (regarding how much he had prayed). The hypocrites who prayed with him said: 'Don't you see that he has two hearts, a heart with you and another with them?' So Allah revealed: 'Allah has not made for any man two hearts inside his body.'"

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ عَبْدِ الرَّحْمَنِ، أَخْبَرَنَا صَاعِدٌ الْحَرَّانِيُّ، حَدَّثَنَا زُهَيْرٌ، أَخْبَرَنَا قَابُوسُ بْنُ أَبِي ظَبْيَانَ، أَنَّ أَبَاهُ، حَدَّثَهُ قَالَ قُلْنَا لاِبْنِ عَبَّاسٍ أَرَأَيْتَ قَوْلَ اللَّهِ عَزَّ وَجَلَّ : (ما جَعَلَ اللَّهُ لِرَجُلٍ مِنْ قَلْبَيْنِ فِي جَوْفِهِ ) مَا عَنَى بِذَلِكَ قَالَ قَامَ نَبِيُّ اللَّهِ ﷺ يَوْمًا يُصَلِّي فَخَطَرَ خَطْرَةً فَقَالَ الْمُنَافِقُونَ الَّذِينَ يُصَلُّونَ مَعَهُ أَلاَ تَرَى أَنَّ لَهُ قَلْبَيْنِ قَلْبًا مَعَكُمْ وَقَلْبًا مَعَهُمْ . فَأَنْزَلَ اللَّهُ : (ما جَعَلَ اللَّهُ لِرَجُلٍ مِنْ قَلْبَيْنِ فِي جَوْفِهِ ) .