Sunan Abi Dawud 400
سنن أبي داود#400Sahihحَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبِيدَةُ بْنُ حُمَيْدٍ، عَنْ أَبِي مَالِكٍ الأَشْجَعِيِّ، سَعْدِ بْنِ طَارِقٍ عَنْ كَثِيرِ بْنِ مُدْرِكٍ، عَنِ الأَسْوَدِ، أَنَّ عَبْدَ اللَّهِ بْنَ مَسْعُودٍ، قَالَ كَانَتْ قَدْرُ صَلاَةِ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي الصَّيْفِ ثَلاَثَةَ أَقْدَامٍ إِلَى خَمْسَةِ أَقْدَامٍ وَفِي الشِّتَاءِ خَمْسَةَ أَقْدَامٍ إِلَى سَبْعَةِ أَقْدَامٍ .
Narrated Abdullah ibn Mas'ud: The extent of the shadow when the Messenger of Allah prayed (the noon prayer) was three to five feet in summer and five to seven feet in winter
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 2:10