And thou didst hide in thy mind that which Allah was to bring to light , and thou didst fear mankind whereas Allah hath a better right that thou shouldst fear Him . So when Zeyd had performed that necessary formality ( of divorce ) from her , We gave her unto thee in marriage , so that ( henceforth ) there may be no sin for believers in respect of wives of their adopted sons , when the latter have performed the necessary formality ( of release ) from them .