Sunan an-Nasa'i 1943
سنن النسائي#1943Sahihأَخْبَرَنِي أَحْمَدُ بْنُ بَكَّارٍ الْحَرَّانِيُّ، قَالَ حَدَّثَنَا بِشْرُ بْنُ السَّرِيِّ، عَنْ سَعِيدٍ الثَّقَفِيِّ، عَنْ عَمِّهِ، زِيَادِ بْنِ جُبَيْرِ بْنِ حَيَّةَ عَنْ أَبِيهِ، عَنِ الْمُغِيرَةِ بْنِ شُعْبَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " الرَّاكِبُ خَلْفَ الْجَنَازَةِ وَالْمَاشِي حَيْثُ شَاءَ مِنْهَا وَالطِّفْلُ يُصَلَّى عَلَيْهِ " .
It was narrated that Al-Mughirah bin Shu'bah said:"The Messenger of Allah said: "The rider should travel behind the Janazah and the pedestrian may travel 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: 21:126