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suyuti:12303a
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السيوطي:١٢٣٠٣a

"بَطَنَ القَدَمِ يَا أَبَا الهَيثَم".  

[طب] الطبرانى في الكبير عن أبي الهيثم

See similar narrations below:

Collected by Ṭabarānī, Suyūṭī
tabarani:19205Wrd b. Aḥmad b. Labīd al-Bayrūtī > Ṣafwān b. Ṣāliḥ > al-Walīd b. Muslim > Ibn Lahīʿah > Bakr b. Sawādah > Abū al-Haytham

[Machine] The Prophet of Allah ﷺ saw me performing ablution and said, "Wash the belly of the feet, O Abu Al-Haytham."  

الطبراني:١٩٢٠٥حَدَّثَنَا ورْدُ بْنُ أَحْمَدَ بْنِ لَبِيدٍ الْبَيْرُوتِيُّ ثنا صَفْوَانُ بْنُ صَالِحٍ ثنا الْوَلِيدُ بْنُ مُسْلِمٍ عَنِ ابْنِ لَهِيعَةَ عَنْ بَكْرِ بْنِ سَوَادَةَ قَالَ حَدَّثَنِي أَبُو الْهَيْثَمِ قَالَ

رَآنِي رَسُولُ اللهِ ﷺ أَتَوَضَّأُ فَقَالَ «بَطْنُ الْقَدَمِ يَا أَبَا الْهَيْثَمِ»