Not graded
Musnad Ahmad 8689
وَبِهَذَا الْإِسْنَادِ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَكَلَ ثَوْرَ أَقِطٍ فَتَوَضَّأَ مِنْهُ وَصَلَّى
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ahmad (No. 8689).