[But] how shall this remembrance avail them [at the Last Hour], seeing that an apostle had previously come unto them, clearly expounding the truth,

How shall the message be (effectual) for them, seeing that an Apostle explaining things clearly has (already) come to them,-

How can there be remembrance for them, when a messenger making plain (the Truth) had already come unto them,

When will they be reminded? And a Messenger has indeed come, making clear;

How will there be for them a reminder [at that time]? And there had come to them a clear Messenger.