The word(s) "forbidden" appears 42 time(s) in 37 verse(s) in Quran in Abdullah Yusuf Ali translation.

(31) Let no man guilty of adultery or fornication marry and but a woman similarly guilty, or an Unbeliever: nor let any but such a man or an Unbeliever marry such a woman: to the Believers such a thing is forbidden.

(32) The Day they see the angels,- no joy will there be to the sinners that Day: The (angels) will say: "There is a barrier forbidden (to you) altogether!"

(33) It is He Who has let free the two bodies of flowing water: One palatable and sweet, and the other salt and bitter; yet has He made a barrier between them, a partition that is forbidden to be passed.

(34) Say: "I have been forbidden to invoke those whom ye invoke besides Allah,- seeing that the Clear Signs have come to me from my Lord; and I have been commanded to bow (in Islam) to the Lord of the Worlds."

(35) Whose season is not limited, nor (supply) forbidden,

(36) Turnest thou not thy sight towards those who were forbidden secret counsels yet revert to that which they were forbidden (to do)? And they hold secret counsels among themselves for iniquity and hostility, and disobedience to the Messenger. And when they come to thee, they salute thee, not as Allah salutes thee, (but in crooked ways): And they say to themselves, "Why does not Allah punish us for our words?" Enough for them is Hell: In it will they burn, and evil is that destination!

(37) O Prophet! Why holdest thou to be forbidden that which Allah has made lawful to thee? Thou seekest to please thy consorts. But Allah is Oft-Forgiving, Most Merciful.