We were with Messenger of Allah ﷺ in a journey, and I was riding a camel meant for carrying water and it lagged behind all persons. Messenger of Allah ﷺ hit it or goaded it (I think) with something he had with him. And after it (it moved so quickly) that it went ahead of all persons and it struggled with me (to move faster than I permitted It) and I had to restrain it. Messenger of Allah ﷺ said: Do you sell it at such and such (price)? May Allah grant you pardon. I said: Allah's Apostle, it is yours. He (again) said: Do you sell it at such and such (price)? May Allah grant you pardon. ' I said: Allah's Apostle, it is yours. He said to me: Have you married after the death of your father? I said: Yes. He (again) said: With one previously married or a virgin? I said: With one previously married. He said: Why didn't you marry a virgin who might amuse you and you might amuse her, and she might sport with you and you might sport with her? Abu Nadra said: That was the common phrase which the Muslims spoke:" You do such and such (thing) and Allah may grant you pardon."  

كُنَّا فِي مَسِيرٍ مَعَ رَسُولِ اللَّهِ ﷺ وَأَنَا عَلَى نَاضِحٍ إِنَّمَا هُوَ فِي أُخْرَيَاتِ النَّاسِ قَالَ فَضَرَبَهُ رَسُولُ اللَّهِ ﷺ أَوْ قَالَ نَخَسَهُ أُرَاهُ قَالَ بِشَىْءٍ كَانَ مَعَهُ قَالَ فَجَعَلَ بَعْدَ ذَلِكَ يَتَقَدَّمُ النَّاسَ يُنَازِعُنِي حَتَّى إِنِّي لأَكُفُّهُ قَالَ فَقَالَ رَسُولُ اللَّهِ ﷺ أَتَبِيعُنِيهِ بِكَذَا وَكَذَا وَاللَّهُ يَغْفِرُ لَكَ قَالَ قُلْتُ هُوَ لَكَ يَا نَبِيَّ اللَّهِ قَالَ أَتَبِيعُنِيهِ بِكَذَا وَكَذَا وَاللَّهُ يَغْفِرُ لَكَ قَالَ قُلْتُ هُوَ لَكَ يَا نَبِيَّ اللَّهِ قَالَ وَقَالَ لِي أَتَزَوَّجْتَ بَعْدَ أَبِيكَ قُلْتُ نَعَمْ قَالَ ثَيِّبًا أَمْ بِكْرًا قَالَ قُلْتُ ثَيِّبًا قَالَ فَهَلاَّ تَزَوَّجْتَ بِكْرًا تُضَاحِكُكَ وَتُضَاحِكُهَا وَتُلاَعِبُكَ وَتُلاَعِبُهَا قَالَ أَبُو نَضْرَةَ فَكَانَتْ كَلِمَةً يَقُولُهَا الْمُسْلِمُونَ افْعَلْ كَذَا وَكَذَا وَاللَّهُ يَغْفِرُ لَكَ  

"We were traveling with the Messenger of Allah and I was riding a camel. The Messenger of Allah said to me: 'Will you sell it to me for such and such, may Allah forgive you?', I said, I said, 'Yes, it is yours, O Prophet of Allah.' He said: 'Will you sell it to me for such and such, may Allah forgive your?' I said: 'Yes, it is yours, O Prophet of "Allah.' He said: 'Will you sell it to me for such and such, may Allah forgives you?' I said: 'Yes, it is yours. '''(One of the narrators) Abu Nadrah said: "This became a phrase that was used by the Muslims: 'Do such and such, may Allah forgive you. (Using translation from Nasāʾī 4641)   

كُنَّا نَسِيرُ مَعَ رَسُولِ اللهِ ﷺ وَأَنَا عَلَى نَاضِحٍ فَقَالَ رَسُولُ اللهِ ﷺ «أَتَبِيعُنِيهِ بِكَذَا وَكَذَا وَاللهُ يَغْفِرُ لَكَ؟» قُلْتُ هُوَ لَكَ يَا نَبِيَّ اللهِ قَالَ أَتَبِيعُنِيهِ بِكَذَا وَكَذَا وَاللهُ يَغْفِرُ لَكَ؟ قُلْتُ نَعَمْ هُوَ لَكَ قَالَ أَبُو نَضْرَةَ وَكَانَتْ كَلِمَةً يَقُولُهَا الْمُسْلِمُونَ افْعَلْ كَذَا وَكَذَا وَاللهُ يَغْفِرُ لَكَ