An-Nisaa 4:43

O you who believe, do not approach the prayer while you are intoxicated[31] until you know what you are saying, nor in a state of major impurity – except while passing through [a mosque] – until you take a bath. If you are ill, or on a journey, or have relieved yourselves, or had intercourse with [your] women and find no water, then purify yourselves with clean earth and wipe your faces and hands with it. For Allah is Ever-Pardoning, All-Forgiving.

[31] The use of intoxicants was later prohibited completely. See 5:90-91.

O you who have believed, do not approach prayer while you are intoxicated until you know what you are saying[187] or in a state of janābah,[188] except those passing through [a place of prayer], until you have washed [your whole body]. And if you are ill or on a journey or one of you comes from the place of relieving himself or you have contacted women [i.e., had sexual intercourse] and find no water, then seek clean earth and wipe over your faces and your hands [with it]. Indeed, Allāh is ever Pardoning[189] and Forgiving.

[187] The use of intoxicants was later prohibited completely. See 5:90-91.
[188] Literally, "distance." The state of one under obligation to perform ghusl (a complete bath) due to having had sexual intercourse or ejaculation.
[189] Literally, able to erase and remove sins completely, leaving no trace of them in the record of deeds.

43. O you who believe! Approach not As-Salât (the prayer) when you are in a drunken state until you know (the meaning) of what you utter, nor when you are in a state of Janâba ,(i.e. in a state of sexual impurity and have not yet taken a bath) except when travelling on the road (without enough water, or just passing through a mosque), till you wash your whole body. And if you are ill, or on a journey, or one of you comes after answering the call of nature, or you have been in contact with women (by sexual relations) and you find no water, perform Tayammum with clean earth and rub therewith your faces and hands (Tayammum)[14]. Truly, Allâh is Ever Oft-Pardoning, Oft-Forgiving.

[14] (V.4:43) Strike your hands on the earth and then pass the palm of each on the back of the other and then blow off the dust from them and then pass (rub) them on your face, this is called Tayammum

O ye who believe! Draw not near unto prayer when ye are drunken, till ye know that which ye utter, nor when ye are polluted, save when journeying upon the road, till ye have bathed. And if ye be ill, or on a journey, or one of you cometh from the closet, or ye have touched women, and ye find not water, then go to high clean soil and rub your faces and your hands (therewith). Lo! Allah is Benign, Forgiving.