We have commanded you to pray and fast from the beginning of maturity; this is ordained by God, your Lord and the Lord of your forefathers. He hath exempted from this those who are weak from illness or age, as a bounty from His Presence, and He is the Forgiving, the Generous. God hath granted you leave to prostrate yourselves on any surface that is clean, for We have removed in this regard the limitation that had been laid down in the Book; God, indeed, hath knowledge of that whereof ye know naught. Let him that findeth no water for ablution repeat five times the words "In the Name of God, the Most Pure, the Most Pure", and then proceed to his devotions. Such is the command of the Lord of all worlds. In regions where the days and nights grow long, let times of prayer be gauged by clocks and other instruments that mark the passage of the hours. He, verily, is the Expounder, the Wise.

God hath granted you leave to prostrate yourselves on any surface that is clean, for We have removed in this regard the limitation that had been laid down in the Book
The requirements of prayer in previous Dispensations have often included prostration. In the Arabic Bayán the Báb called upon the believers to lay their foreheads on surfaces of crystal when prostrating. Similarly, in Islám, certain restrictions are imposed with regard to the surface on which Muslims are permitted to prostrate. Bahá’u’lláh abrogates such restrictions and simply specifies “any surface that is clean”.