Hugging One's Spouse While Fasting
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In optional fasts, kissing, hugging, etc. are permitted so long as one
does not engage in sexual intercourse. In obligatory fasts, one is
allowed to do these only if one can control oneself. Therefore, no one
who is fasting should do such things if there is a genuine risk of
overstepping the boundaries. If there is no such fear, then light
touching, or kissing, etc, when not accompanied by sexual desire, is
permissible.
In his response to your question, Sheikh Ahmad Kutty, a senior
lecturer and Islamic scholar at the Islamic Institute of Toronto,
Ontario, Canada, states:
Hugging your spouse in itself does not invalidate the fast; we read in
the sources that the Prophet (peace and blessings be upon him) used to
kiss his wife while fasting. We also read that once a person asked the
Prophet (peace and blessings be upon him)
“Am I allowed to kiss my wife while fasting?” He replied,
“Yes.”
Hugging is comparable to kissing.
Having said this, however, I must caution you to abstain from such acts
if you find yourself unable to control your desire, for as Muslims we
must keep away from all such acts that may inadvertently lead to
invalidating our fasts. This is why we read in another hadith that the
Prophet told another person not to kiss his spouse. In explaining the
discrepancy between the two reports, Ibn `Abbas said, “The man he
permitted was an older person, while the man he prohibited was a young
man.” Therefore, if you have any doubt or fear of being unable to
control yourself, then you should simply abstain from such actions
altogether in order to save your fast. This is why the Prophet’s wife `A’ishah
(may Allah be pleased with her) asked a person, 'Who among you is
capable of restraining himself as the Prophet (peace and blessings be
upon him) had been?'