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Ahmed Raza Khan: Mohammed Aqib Qadri:
They ask you, (O dear Prophet Mohammed - peace and blessings be upon him), regarding the crescents; say, "They are indicators of time for mankind and for Hajj (the pilgrimage)"; and it is not a virtue at all that you enter the houses by demolishing their back portions, but in reality virtue is piety; and enter the houses using their gates - and keep fearing Allah, hoping that you achieve success.

Yusuf Ali:
They ask thee concerning the New Moons. Say: They are but signs to mark fixed periods of time in (the affairs of) men, and for Pilgrimage. It is no virtue if ye enter your houses from the back: It is virtue if ye fear Allah. Enter houses through the proper doors: And fear Allah: That ye may prosper.

Pickthal:
They ask thee, (O Muhammad), of new moons, say: They are fixed seasons for mankind and for the pilgrimage. It is not righteousness that ye go to houses by the backs thereof (as do the idolaters at certain seasons), but the righteous man is he who wardeth off (evil). So go to houses by the gates thereof, and observe your duty to Allah, that ye may be successful.