The Messenger of Allah ﷺ entered the mosque and saw there some people praying raising their hand towards the heaven. (This Is the common version: ) He said : People must stop raising their eyes to the heaven. The narrator Musaddad said: During prayer, otherwise their sight will be taken away.  

دَخَلَ رَسُولُ اللَّهِ ﷺ الْمَسْجِدَ فَرَأَى فِيهِ نَاسًا يُصَلُّونَ رَافِعِي أَيْدِيهِمْ إِلَى السَّمَاءِ ثُمَّ اتَّفَقَا فَقَالَ لَيَنْتَهِيَنَّ رِجَالٌ يَشْخَصُونَ أَبْصَارَهُمْ إِلَى السَّمَاءِ قَالَ مُسَدَّدٌ فِي الصَّلاَةِ أَوْ لاَ تَرْجِعُ إِلَيْهِمْ أَبْصَارُهُمْ  

What is the matter that people raise their (Upwards) in prayer. He then said sternly: They should stop doing that, otherwise their sight will be snatched away.  

قَالَ رَسُولُ اللَّهِ ﷺ مَا بَالُ أَقْوَامٍ يَرْفَعُونَ أَبْصَارَهُمْ فِي صَلاَتِهِمْ فَاشْتَدَّ قَوْلُهُ فِي ذَلِكَ فَقَالَ لَيَنْتَهُنَّ عَنْ ذَلِكَ أَوْ لَتُخْطَفَنَّ أَبْصَارُهُمْ  

the Messenger of Allah ﷺ once prayed with a sheet of cloth upon him. It had prints and paintings. He said: The prints of this (sheet) distracted my attention; take it to Abu Jahm and bring a blanket to me.  

صَلَّى رَسُولُ اللَّهِ ﷺ فِي خَمِيصَةٍ لَهَا أَعْلاَمٌ فَقَالَ شَغَلَتْنِي أَعْلاَمُ هَذِهِ اذْهَبُوا بِهَا إِلَى أَبِي جَهْمٍ وَأْتُونِي بِأَنْبِجَانِيَّتِهِ  

He (the prophet) took a kind of sheet of cloth known as kurdi which belongs to Abu Jahm. The people told him; Messenger of Allah, the (former) sheet of cloth was better than this kind of kurdi sheet.  

وَأَخَذَ كُرْدِيًّا كَانَ لأَبِي جَهْمٍ فَقِيلَ يَا رَسُولَ اللَّهِ الْخَمِيصَةُ كَانَتْ خَيْرًا مِنَ الْكُرْدِيِّ