When the Prophet ﷺ recited a Sura that contained the prostration he would prostrate and we would do the same and some of us (because of the heavy rush) could not find a place for prostration.  

كَانَ النَّبِيُّ ﷺ يَقْرَأُ عَلَيْنَا السُّورَةَ فِيهَا السَّجْدَةُ فَيَسْجُدُ وَنَسْجُدُ حَتَّى مَا يَجِدُ أَحَدُنَا مَوْضِعَ جَبْهَتِهِ  

The Prophet ﷺ recited Suratan-Najm (103) at Mecca and prostrated while reciting it and those who were with him did the same except an old man who took a handful of small stones or earth and lifted it to his forehead and said, "This is sufficient for me." Later on, I saw him killed as a non-believer.  

قَرَأَ النَّبِيُّ ﷺ النَّجْمَ بِمَكَّةَ فَسَجَدَ فِيهَا وَسَجَدَ مَنْ مَعَهُ غَيْرَ شَيْخٍ أَخَذَ كَفًّا مِنْ حَصًى أَوْ تُرَابٍ فَرَفَعَهُ إِلَى جَبْهَتِهِ وَقَالَ يَكْفِينِي هَذَا فَرَأَيْتُهُ بَعْدَ ذَلِكَ قُتِلَ كَافِرًا  

I asked Zaid bin Thabit about prostration on which he said that he had recited An-Najm before the Prophet, yet he (the Prophet) had not performed a prostration.  

أَنَّهُ سَأَلَ زَيْدَ بْنَ ثَابِتٍ ؓ فَزَعَمَ أَنَّهُ قَرَأَ عَلَى النَّبِيِّ ﷺ {وَالنَّجْمِ} فَلَمْ يَسْجُدْ فِيهَا  

Once I prayed the ʿIsha' prayer with Abu Huraira and he recited, "Idha s-samaa'u n-shaqqat" (84) and prostrated. I said, "What is that?" He said, "I prostrated behind Abul-Qasim, (the Prophet) (when he recited that Sura) and I will go on doing it till I meet him."  

صَلَّيْتُ مَعَ أَبِي هُرَيْرَةَ الْعَتَمَةَ فَقَرَأَ {إِذَا السَّمَاءُ انْشَقَّتْ} فَسَجَدَ فَقُلْتُ مَا هَذِهِ قَالَ سَجَدْتُ بِهَا خَلْفَ أَبِي الْقَاسِمِ ﷺ فَلاَ أَزَالُ أَسْجُدُ بِهَا حَتَّى أَلْقَاهُ