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suyuti:1517a
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السيوطي:١٥١٧a

"إذَ تصافَح المسلمانِ لم تَفَرَّقُ أكفُّهما حتى يُغْفر لَهُما ".  

[طب] الطبرانى في الكبير عن أبي أمامة

See similar narrations below:

Collected by Ṭabarānī, Suyūṭī
tabarani:8076Muḥammad b. Khālid al-Rāsibī > Muhallab b. al-ʿAlāʾ > Shuʿayb b. Bayān al-Ṣaffār > Ḥammād b. Salamah > Abū Ghālib > Abū Umāmah

[Machine] The Prophet of Allah ﷺ said: "When two Muslims shake hands, their palms should not be separated until their sins are forgiven."  

الطبراني:٨٠٧٦حَدَّثَنَا مُحَمَّدُ بْنُ خَالِدٍ الرَّاسِبِيُّ ثنا مُهَلَّبُ بْنُ الْعَلَاءِ ثنا شُعَيْبُ بْنُ بَيَانَ الصَّفَّارُ ثنا حَمَّادُ بْنُ سَلَمَةَ عَنْ أَبِي غَالِبٍ عَنْ أَبِي أُمَامَةَ

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «إِذَا تَصَافَحَ الْمُسْلِمَانِ لَمْ تَفْرُقْ أَكُفُّهُمَا حَتَّى يُغْفَرَ لَهُمْا»