I adjure you by Allah if you had not heard Allah's Apostle ﷺ saying: Hassin, give a reply on behalf of the Messenger of Allah. O Allah, help him with Ruh-ul-Qudus. Abu Huraira said: Yes, it is so.
سَمِعْتَ النَّبِيَّ ﷺ يَقُولُ يَا حَسَّانُ أَجِبْ عَنْ رَسُولِ اللَّهِ ﷺ اللَّهُمَّ أَيِّدْهُ بِرُوحِ الْقُدُسِ قَالَ أَبُو هُرَيْرَةَ نَعَمْ
I asked Abu Huraira "By Allah! Tell me the truth whether you heard the Prophet ﷺ saying, 'O Hassan! Reply on behalf of Messenger of Allah ﷺ. O Allah! Help him with the Holy Spirit." Abu Huraira said, "Yes . "
سَمِعْتَ النَّبِيَّ ﷺ يَقُولُ يَا حَسَّانُ أَجِبْ عَنْ رَسُولِ اللَّهِ ﷺ اللَّهُمَّ أَيِّدْهُ بِرُوحِ الْقُدُسِ قَالَ أَبُو هُرَيْرَةَ نَعَمْ
that he heard Hassan bin Thabit Al-Ansari asking the witness of Abu Huraira, saying, "O Abu- Huraira! I beseech you by Allah (to tell me). Did you hear Messenger of Allah ﷺ saying' 'O Hassan ! Reply on behalf of Messenger of Allah ﷺ. O Allah ! Support him (Hassan) with the Holy Spirit (Gabriel).'?" Abu Huraira said, "Yes."
سَمِعْتَ رَسُولَ اللَّهِ ﷺ يَقُولُ يَا حَسَّانُ أَجِبْ عَنْ رَسُولِ اللَّهِ اللَّهُمَّ أَيِّدْهُ بِرُوحِ الْقُدُسِ قَالَ أَبُو هُرَيْرَةَ نَعَمْ
"Umar passed by Hassan bin Thabit while he was reciting poetry in the Masjid, and glared at him. He said: 'I recited poetry when there was someone better than you in the Masjid.' Then he turned to Abu Hurairah and said: 'Did you not hear the Messenger of Allah ﷺ when he said: "Answer back on my behalf. O Allah, help him with the Holy Spirit!'" He said: 'Yes, by Allah.'"
قَدْ أَنْشَدْتُ وَفِيهِ مَنْ هُوَ خَيْرٌ مِنْكَ ثُمَّ الْتَفَتَ إِلَى أَبِي هُرَيْرَةَ فَقَالَ أَسَمِعْتَ رَسُولَ اللَّهِ ﷺ يَقُولُ أَجِبْ عَنِّي اللَّهُمَّ أَيِّدْهُ بِرُوحِ الْقُدُسِ قَالَ اللَّهُمَّ نَعَمْ
I adjure you by Allah if you had not heard Allah's Apostle ﷺ saying: Hassin, give a reply on behalf of the Messenger of Allah. O Allah, help him with Ruh-ul-Qudus. Abu Huraira said: Yes, it is so. (Using translation from Muslim 2485c)
سَمِعْتَ رَسُولَ اللَّهِ ﷺ يَقُولُ «أَجِبْ عَنِّي اللَّهُمَّ أَيِّدْهُ بِرُوحِ الْقُدُسِ» قَالَ نَعَمْ
[Machine] I would like to ask you, O Abu Hurayrah, did you hear the Messenger of Allah ﷺ say, "May Allah assist you with the Holy Spirit?" He said, "Yes, O Allah."
لَهُ أَنْشُدُكَ اللهَ يَا أَبَا هُرَيْرَةَ أَسَمِعْتَ رَسُولَ اللهِ ﷺ يَقُولُ «أَجِبْ عَنِّي أَيَّدَكَ اللهُ بِرُوحِ الْقُدُسِ؟» قَالَ اللهُمَّ نَعَمْ
"Umar passed by Hassan bin Thabit while he was reciting poetry in the Masjid, and glared at him. He said: 'I recited poetry when there was someone better than you in the Masjid.' Then he turned to Abu Hurairah and said: 'Did you not hear the Messenger of Allah ﷺ when he said: "Answer back on my behalf. O Allah, help him with the Holy Spirit!'" He said: 'Yes, by Allah.'" (Using translation from Nasāʾī 716)
قَدْ أَنْشَدْتُ وَفِيهِ مَنْ هُوَ خَيْرٌ مِنْكَ ثُمَّ الْتَفَتَ إِلَى أَبِي هُرَيْرَةَ فَقَالَ أَسَمِعْتَ رَسُولَ اللهِ ﷺ يَقُولُ «أَجِبْ عَنِّي اللهُمَّ أَيِّدْهُ بِرُوحِ الْقُدُسِ» قَالَ اللهُمَّ نَعَمْ
[Machine] I heard the Messenger of Allah, ﷺ , saying, "O Hassan, respond on behalf of the Messenger of Allah, ﷺ . O Allah, support him with the Holy Spirit." Abu Hurairah replied, "Yes."
سَمِعْتَ رَسُولَ اللهِ ﷺ يَقُولُ يَا حَسَّانُ أَجِبْ عَنْ رَسُولِ اللهِ ﷺ اللهُمَّ أَيِّدْهُ بِرُوحِ الْقُدُسِ فَقَالَ أَبُو هُرَيْرَةَ ؓ نَعَمْ
"يَا حَسَّانُ: أَجِبْ عَنْ رَسُولِ الله، اللَّهُمَّ أيِّدْهُ بِرُوحِ الْقُدُسِ".