Surah 2:106:

"None of Our revelations do We abrogate or cause to be forgotten, but We substitute something better or similar: Knowest thou not that Allah Hath power over all things?"

Surah 16:101

When We substitute one revelation for another,- and Allah knows best what He reveals - they say, "Thou art but a forger": but most of them understand not.

Surah 2:219:

They ask thee concerning wine and gambling. Say: "In them is great sin, and some profit, for men; but the sin is greater than the profit." They ask thee how much they are to spend; Say: "What is beyond your needs." Thus doth Allah Make clear to you His Signs: In order that ye may consider-"

Surah 4:43:

"O ye who believe! Approach not prayers with a mind befogged, until ye can understand all that ye say,- nor in a state of ceremonial impurity (Except when travelling on the road), until after washing your whole body. If ye are ill, or on a journey, or one of you cometh from offices of nature, or ye have been in contact with women, and ye find no water, then take for yourselves clean sand or earth, and rub therewith your faces and hands. For Allah doth blot out sins and forgive again and again."

Surah 5:93:

"O ye who believe! Intoxicants and gambling, (Dedication of) stones, and (divination by) arrows, are an abomination, - of Satan’s handiwork: Eschew such (abomination), that ye may prosper."