Why shaking hands with a girl haram in Islam ?
Kissing a woman or touching a special part of her body is a sin. But this is not real adultery ( Zina ). Because real adultery ( Zina ) is only intercourse.
Also for another knowledge read Is kissing your love considered to be zina according to Quran
And shaking hands is considered to be touching and this is forbidden by Islamic sheria ,So if a girls is not your maharim your not allowed to touch her hand
But this issues of shaking hands witha girls or women is one of the controversial issues in Islamic Jurisprudence. The majority of scholars maintain that it is unlawful except for the Hanafis and Hanbalis who permit shaking hands with elderly women who do not arouse desire.
Evidence on which the majority of scholars base their opinion about shaking hands with a girl
-The words of ‘Aisha, may Allah be pleased with her, who said: “The Prophet’s hands never touched those of a woman” [Muslim and Bukhari).
– Mu’qal Ibn Yasar, may Allah be pleased with him, narrated that the Prophet [peace and blessings be upon him] said: “It is better that you be struck on your head with an iron needle than to touch a woman you are not allowed to” [Reported by al-Ruyani in his Musnad and by al-Tabarani in al-Mu’jam al-Kabir).
– They maintain that the prohibition of shaking hands with a non-mahram woman is even greater than looking at her. Since the prohibition of looking at a non-mahram woman is known, the prohibition of shaking hands with her takes precedence over the former.
Some scholars opine that it is permissible to shake hands with a non-Mahram woman. They base their opinion on the following:
– The incidence of ‘Umar ibn al-Khattab shaking hands with women when the prophet [peace and blessings be upon him] refused to do so when they came to pledge their allegiance to him.
– The incidence of Abu-Bakr shaking hands with an old woman during his caliphate.
– It has been reported by al-Bukhari that the Prophet [peace and blessings be upon him] used to allow Um Haram to comb his hair.
– Al-Bukhari reported that a woman from among the Ash’arites combed abu Musa al-Ash’ari’s hair while he was in a state of ihram.