حَدَّثَنَا عَبْدُ الصَّمَدِ بْنُ عَبْدِ الْوَارِثِ، حَدَّثَنَا هِشَامٌ، عَنْ قَتَادَةَ، عَنْ أَبِي حَرْبِ بْنِ أَبِي الْأَسْوَدِ، عَنْ أَبِيهِ، عَنْ عَلِيٍّ
رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بَوْلُ الْغُلَامِ يُنْضَحُ عَلَيْهِ وَبَوْلُ الْجَارِيَةِ يُغْسَلُ قَالَ قَتَادَةُ هَذَا مَا لَمْ يَطْعَمَا فَإِذَا طَعِمَا غُسِلَ بَوْلُهُمَا
The Messenger of Allah (sallallahu alayhi wa sallam) said: ‘The urine of a boy is to be sprinkled with water and the urine of a girl is to be washed.’ Qatadah said: That is if they are not yet eating solid food; if they are eating solid food then their urine is to be washed in both cases.
Musnad Ahmad 530, Book 5, Musnad 'Ali Ibn Abi Talib, Hadith 2. 1 min read