Sunan an-Nasa'i 1948
سنن النسائي#1948Sahihأَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا سَعِيدُ بْنُ عُبَيْدِ اللَّهِ، قَالَ سَمِعْتُ زِيَادَ بْنَ جُبَيْرٍ، يُحَدِّثُ عَنْ أَبِيهِ، عَنِ الْمُغِيرَةِ بْنِ شُعْبَةَ، أَنَّهُ ذَكَرَ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " الرَّاكِبُ خَلْفَ الْجَنَازَةِ وَالْمَاشِي حَيْثُ شَاءَ مِنْهَا وَالطِّفْلُ يُصَلَّى عَلَيْهِ " .
It was narrated from Al-Mughirah bin Shu'bah that:the Messenger of Allah said: "The rider should move behind the Janazah and the pedestrian may walk wherever he wishes, and the (funeral) prayer should be offered for a child
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: 21:131