But God did not choose thus to chastise them whip thou [O Prophet] wert still among them, nor would God chastise them when they [might yet] ask for forgiveness.

But God was not going to send them a penalty whilst thou wast amongst them; nor was He going to send it whilst they could ask for pardon.

But Allah would not punish them while thou wast with them, nor will He punish them while they seek forgiveness.

And Allah would not chastise them while thou wast among them; nor would Allah chastise them while they seek forgiveness.

But Allah would not punish them while you, [O Muhammad], are among them, and Allah would not punish them while they seek forgiveness.