Kitāb al-Muʾmin

Hadith 78
taqwa
78 - وعن أبي جعفر عليه السلام قال: إن المؤمنين إذا التقيا فتصافحا أدخل الله يده فصافح أشدهما حبا لصاحبه.
78. It has been reported that Abu Ja'far (a.s) said: When two believers meet and shake hands, Allah puts His Hand in between and it is shaken by the one who loves the other the most.
Source: Ḥusayn b. Saʿīd al-Ahwāzī