Hadith 1509
حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا الْبَخْتَرِيُّ بْنُ عُبَيْدٍ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ النَّبِيُّ ـ صلى الله عليه وسلم ـ " صَلُّوا عَلَى أَطْفَالِكُمْ فَإِنَّهُمْ مِنْ أَفْرَاطِكُمْ " .
It was narrated that Abu Hurairah said:“The Prophet (ﷺ) said: ‘Offer the (funeral) prayer for your children, for they have gone ahead of you (i.e. to prepare your place in Paradise for you).”
Very Daif (Al-Albani)
Sunan Ibn Majah 1509 · Book 6, Hadith 77