43:81 qul in kaana lir raHmaani waladun fa ana aw-walul 'AAbidiyn

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Ahmed Raza Khan: Mohammed Aqib Qadri:
Proclaim (O dear Prophet Mohammed - peace and blessings be upon him), "If supposedly, the Most Gracious had an offspring* - I would be the first to worship!" (*Which is impossible)

Yusuf Ali:
Say: "If (Allah) Most Gracious had a son, I would be the first to worship."

Pickthal:
Say (O Muhammad): If the Beneficent One hath a son, then, I shall be first among the worshippers. (But there is no son).