The Messenger of Allah ﷺ entered the mosque and saw a man who had finished his prayer, and was reciting the tashahhud saying: O Allah, I ask you, O Allah, the One, the eternally besought of all, He begetteth not, nor was He begotten, and there is none comparable unto Him, that you may forgive me my sins, you are Most Forgiving, Merciful. He (the Prophet) said: He was forgiven (repeating three times.) (Using translation from Abū Dāʾūd 985)   

أَنَّ رَسُولَ اللهِ ﷺ دَخَلَ الْمَسْجِدَ فَإِذَا رَجُلٌ قَدْ قَضَى صَلَاتَهُ وَهُوَ يَتَشَهَّدُ فَقَالَ إِنِّي أَسْأَلُكَ يَا اللهُ الْوَاحِدُ الْأَحَدُ الصَّمَدُ الَّذِي لَمْ يَلِدْ وَلَمْ يُولَدْ وَلَمْ يَكُنْ لَهُ كَفُّوًا أَحَدٌ أَنْ تَغْفِرَ لِي ذُنُوبِي إِنَّكَ أَنْتَ الْغَفُورُ الرَّحِيمُ فَقَالَ رَسُولُ اللهِ ﷺ «قَدْ غَفَرَ لَهُ» ثَلَاثًا خَالَفَهُ مَالِكُ بْنُ مِغْوَلٍ  

The Messenger of Allah ﷺ heard a man saying: O Allah, I ask Thee, I bear witness that there is no god but Thou, the One, He to Whom men repair, Who has not begotten, and has not been begotten, and to Whom no one is equal, and he said: You have supplicated Allah using His Greatest Name, when asked with this name He gives, and when supplicated by this name he answers. (Using translation from Abū Dāʾūd 1493)   

أَنَّ النَّبِيَّ ﷺ سَمِعَ رَجُلًا يَقُولُ اللهُمَّ إِنِّي أَسْأَلُكَ بِأَنِّي أَشْهَدُ أَنَّكَ أَنْتَ اللهُ لَا إِلَهَ إِلَّا أَنْتَ الْوَاحِدُ الْأَحَدُ الصَّمَدُ فَقَالَ «لَقَدْ سَأَلْتَ اللهَ بِاسْمِهِ الْأَعْظَمِ الَّذِي إِذَا دُعِيَ بِهِ أَجَابَ وَإِذَا سُئِلَ بِهِ أَعْطَى»  

The Prophet ﷺ said, "Allah said: 'The son of Adam tells a lie against Me,, though he hasn't the right to do so. He abuses me though he hasn't the right to do so. As for his telling a lie against Me, it is his saying that I will not recreate him as I created him for the first time. In fact, the first creation was not easier for Me than new creation. As for his abusing Me, it is his saying that Allah has begotten children, while I am the One, the Self-Sufficient Master Whom all creatures need, I beget not, nor was I begotten, and there is none like unto Me." (Using translation from Bukhārī 4974)   

عَنْ رَسُولِ اللهِ ﷺ قَالَ قَالَ اللهُ ﷻ كَذَّبَنِي ابْنُ آدَمَ وَلَمْ يَكُنْ لَهُ أَنْ يُكَذِّبَنِي وَشَتَمَنِي ابْنُ آدَمَ وَلَمْ يَنْبَغِ لَهُ أَنْ يَشْتِمَنِي فَأَمَّا تَكْذِيبُهُ إِيَّايَ فَقَوْلُهُ لَنْ يُعِيدَنِي كَمَا بَنَانِي وَلَيْسَ الْخَلْقُ بِأَهْوَنَ عَلَيَّ مِنْ إِعَادَتِهِ وَأَمَّا شَتْمُهُ فَقَوْلُهُ اتَّخَذَ اللهُ وَلَدًا وَأَنَا اللهُ الْأَحَدُ الصَّمَدُ الَّذِي لَمْ أَلِدْ وَلَمْ أُولَدْ وَلَمْ يَكُنْ لِي كَفُّوا أَحَدٌ