"The Messenger of Allah ﷺ came out to us for one of the nighttime prayers, and he was carrying Hasan or Husain. The Messenger of Allah ﷺ came forward and put him down, then he said the Takbir and started to pray. He prostrated during his prayer, and made the prostration lengthy." My father said: "I raised my head and saw the child on the back of the Messenger of Allah ﷺ while he was prostrating so I went back to my prostration. When the Messenger of Allah ﷺ finished praying, the people said: "O Messenger of Allah ﷺ, you prostrated during the prayer for so long that we thought that something had happened or that you were receiving a revelation.' He said: 'No such thing happened. But my son was riding on my back and I did not like to disturb him until he had enough.'" (Using translation from Nasāʾī 1141)  

خَرَجَ عَلَيْنَا رَسُولُ اللهِ ﷺ فِي إِحْدَى صَلَاتَيِ الْعَشِيِّ الظُّهْرِ أَوِ الْعَصْرِ وَهُوَ حَامِلُ الحَسَنِ أَوْ الْحُسَيْنِ فَتَقَدَّمَ النَّبِيُّ ﷺ فَوَضَعَهُ ثُمَّ كَبَّرَ لِلصَّلَاةِ فَصَلَّى فَسَجَدَ بَيْنَ ظَهْرَيْ صَلَاتِهِ سَجْدَةً أَطَالَهَا قَالَ أَبِي رَفَعْتُ رَأْسِي فَإِذَا الصَّبِيُّ عَلَى ظَهَرِ رَسُولِ اللهِ ﷺ وَهُوَ سَاجِدٌ فَرَجَعْتُ فِي سُجُودِي فَلَمَّا قَضَى رَسُولُ اللهِ ﷺ الصَّلَاةَ قَالَ النَّاسُ يَا رَسُولَ اللهِ إِنَّكَ سَجَدْتَ بَيْنَ ظَهْرَيِ الصَّلَاةِ سَجْدَةً أَطَلْتَهَا حَتَّى ظَنَنَّا أَنَّهُ قَدْ حَدَثَ أَمْرٌ أَوْ أَنَّهُ يُوحَى إِلَيْكَ؟ قَالَ كُلُّذَلِكَ لَمْ يَكُنْ وَلَكِنَّ ابْنِي ارْتَحَلَنِي فَكَرِهْتُ أَنْ أُعَجِّلَهُ حَتَّى يَقْضِيَ حَاجَتَهُ