Imâm Ahmad – Allâh have mercy in him – said:

{Voluntary] bachelorhood has nothing to do with Islâm. The Prophet – Allâh’s peace and blessings be upon him – married fourteen women, and he died being married to nine of them. If Bishr b. Al-Hârith had married, his affairs would be complete. If people left marrying no one would go to battle or go on pilgrimage (Al-Hajj), and such-and-such wouldn’t happen.

He went on to say:

The Prophet – Allâh’s peace and blessings be upon him – would wake in the morning and his family would have nothing to eat and go to bed at night and they would have nothing to eat, [yet] he died married to nine wives, he chose marriage and encouraged others to marry.

Abû Bakr Al-Marrûdhî, Kitâb Al-Wara’ p116, 117.