Hadith.4635 - Abu Basir asked Abu Abdullah (as): "Can a man shake hands with a woman who is not his mahram?"
Imam (as) replied: "No, except from behind a cloth."
Man Lā Yaḥḍuruh al-Faqīh #1295"When a girl reaches six years of age, a boy should not kiss her, and a boy should not kiss a woman once he passes seven years of age."
Al-Kāfi #2005“This is concerning my question before abu ‘Abd Allah (a.s.), if one can shake hands with women who are lawful for marriage. He (the Imam)...