Is it permissible for a man to suckle from his wife's breast, and what is the ruling on his action and his sin if he does so? And is it permissible for a wife to suckle from her own breast, and what is the ruling on her action and her sin if she does so?

A man suckling from his wife's breast does not affect the marriage, though it is more cautious to avoid it. As for a woman doing this herself, if it is done out of lust, then it is not permissible, based on the Almighty's saying: "And those who guard their private parts Except from their wives or those their right hands possess, for indeed, they are not to be blamed But whoever seeks beyond that, then it is those who are the transgressors." If it is done without lust, then there is no harm upon her.