Musnad Ahmad 121
It was narrated from 'Uqbah bin ‘Amir that he went out with the Messenger of Allah ﷺ on the campaign to Tabook, and one day the Messenger of Allah ﷺ sat talking to his companions and said:
“Whoever gets up when the sun has risen and does wudoo’. and does it well, then stands and prays two rak'ahs, his sins will be forgiven him and he will be as his mother bore him.` 'Uqbah bin 'Amir said: I said: Praise be to Allah Who has blessed me by enabling me to hear this from the Messenger of Allah ﷺ. 'Umar bin al-Khattab رضي الله عنه, who was sitting in front of me, said to me: Are you surprised by this? The Messenger of Allah ﷺ said something even more amazing than this before you came. I said: What was it, may my father and mother be sacrificed for you? 'Umar said. The Messenger of Allah ﷺ  said: `Whoever does wudoo’ and does it well, then lifts his gaze towards heaven and says, “I bear witness that there is no god but Allah alone, with no partner or associate, and I bear witness that Muhammad is His slave and Messenger,` the eight gates of Paradise will be opened for him and he may enter by whichever of them he wishes.`
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يَزِيدَ، أَخْبَرَنَا حَيْوَةُ، أَخْبَرَنَا أَبُو عَقِيلٍ، عَنِ ابْنِ عَمِّهِ، عَنْ عُقْبَةَ بْنِ عَامِرٍ، أَنَّهُ خَرَجَ مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي غَزْوَةِ تَبُوكَ فَجَلَسَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَوْمًا يُحَدِّثُ أَصْحَابَهُ فَقَالَ مَنْ قَامَ إِذَا اسْتَقَلَّتْ الشَّمْسُ فَتَوَضَّأَ فَأَحْسَنَ الْوُضُوءَ ثُمَّ قَامَ فَصَلَّى رَكْعَتَيْنِ غُفِرَ لَهُ خَطَايَاهُ فَكَانَ كَمَا وَلَدَتْهُ أُمُّهُ قَالَ عُقْبَةُ بْنُ عَامِرٍ فَقُلْتُ الْحَمْدُ لِلَّهِ الَّذِي رَزَقَنِي أَنْ أَسْمَعَ هَذَا مِنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ لِي عُمَرُ بْنُ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ وَكَانَ تُجَاهِي جَالِسًا أَتَعْجَبُ مِنْ هَذَا فَقَدْ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَعْجَبَ مِنْ هَذَا قَبْلَ أَنْ تَأْتِيَ فَقُلْتُ وَمَا ذَاكَ بِأَبِي أَنْتَ وَأُمِّي فَقَالَ عُمَرُ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَنْ تَوَضَّأَ فَأَحْسَنَ الْوُضُوءَ ثُمَّ رَفَعَ نَظَرَهُ إِلَى السَّمَاءِ فَقَالَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ فُتِحَتْ لَهُ ثَمَانِيَةُ أَبْوَابِ الْجَنَّةِ يَدْخُلُ مِنْ أَيِّهَا شَاءَ‏.‏