Shidad ibn al-Had reported: The Messenger of Allah, peace and blessings be upon him, came out to us for one of the evening prayers and he was carrying his grandson Hasan, or Husayn. The Prophet came forward and put him down, then began prayer with exaltation and prayed. He prostrated at the end of his prayer for a long time. I raised my head and the child was upon the Prophet’s back while he was prostrating, so I returned to my prostration. When the Prophet finished the prayer, people said, “O Messenger of Allah, you prostrated at the end of your prayer for a long time, until we thought something happened or you received a revelation.” The Prophet said, “None of that that happened. Rather, my grandson was riding on my back and I disliked to rush him before he met his needs.”
Source: Sunan al-Nasā’ī 1141
Grade: Sahih (authentic) according to Al-Albani
عَنْ شداد بن الهاد قَالَ خَرَجَ عَلَيْنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي إِحْدَى صَلَاتَيْ الْعِشَاءِ وَهُوَ حَامِلٌ حَسَنًا أَوْ حُسَيْنًا فَتَقَدَّمَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَوَضَعَهُ ثُمَّ كَبَّرَ لِلصَّلَاةِ فَصَلَّى فَسَجَدَ بَيْنَ ظَهْرَانَيْ صَلَاتِهِ سَجْدَةً أَطَالَهَا قَالَ شداد فَرَفَعْتُ رَأْسِي وَإِذَا الصَّبِيُّ عَلَى ظَهْرِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَهُوَ سَاجِدٌ فَرَجَعْتُ إِلَى سُجُودِي فَلَمَّا قَضَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الصَّلَاةَ قَالَ النَّاسُ يَا رَسُولَ اللَّهِ إِنَّكَ سَجَدْتَ بَيْنَ ظَهْرَانَيْ صَلَاتِكَ سَجْدَةً أَطَلْتَهَا حَتَّى ظَنَنَّا أَنَّهُ قَدْ حَدَثَ أَمْرٌ أَوْ أَنَّهُ يُوحَى إِلَيْكَ قَالَ كُلُّ ذَلِكَ لَمْ يَكُنْ وَلَكِنَّ ابْنِي ارْتَحَلَنِي فَكَرِهْتُ أَنْ أُعَجِّلَهُ حَتَّى يَقْضِيَ حَاجَتَهُ
1141 سنن النسائي كتاب التطبيق باب هل يجوز أن تكون سجدة أطول من سجدة
1140 المحدث الألباني خلاصة حكم المحدث صحيح في صحيح النسائي