the Messenger of Allah ﷺ paid attention to the people and said three times; straighten your rows (in prayer); by Allah, you must straighten your rows, or Allah will certainly put your faces in contrary directions. I then saw that every person stood in prayer keeping his shoulder close to that of the other, and his knee close to that of the other, and his ankle close to that of the other. (Using translation from Abū Dāʾūd 662)   

سَمِعْتُ النُّعْمَانَ بْنِ بَشِيرٍ يَقُولُ أَقْبَلَ عَلَيْنَا رَسُولُ اللهِ ﷺ بِوَجْهِهِ فَقَالَ أَقِيمُوا صُفُوفَكُمْ ثَلَاثًا وَاللهِ لَتُقِيمُنَّ صُفُوفَكُمْ أَوْ لَيُخَالِفَنَّ اللهُ بَيْنَ قُلُوبِكُمْ قَالَ فَرَأَيْتُ الرَّجُلَ يُلْزِقُ كَعْبَهُ بِكَعْبِ صَاحِبِهِ وَرُكْبَتَهُ بِرُكْبَةِ صَاحِبِهِ وَمَنْكِبَهُ بِمَنْكِبِهِ  

[Machine] I saw the Messenger of Allah ﷺ passing by the market of Thul-Majaz, while I was selling something of mine. He passed by wearing a red garment and I heard him saying, "O people, say there is no god but Allah, you will be successful." A man followed him and threw stones at him, causing his feet to bleed. The Messenger of Allah ﷺ mentioned this incident.  

رَأَيْتُ رَسُولَ اللهِ ﷺ مَرَّ بِسُوقِ ذِي الْمَجَازِ وَأَنَا فِي بِيَاعَةٍ لِي فَمَرَّ وَعَلَيْهِ حُلَّةٌ حَمْرَاءُ فَسَمِعْتُهُ يَقُولُ يَا أَيُّهَا النَّاسُ قُولُوا لَا إِلَهَ إِلَّا اللهُ تُفْلِحُوا وَرَجُلٌ يَتْبَعُهُ يَرْمِيهِ بِالْحِجَارَةِ قَدْ أَدْمَى كَعْبَيْهِ يَعْنِي أَبَا لَهَبٍ وَذَكَرَ الْحَدِيثَ