فَأَبلِغso tell دُرَيداًDurayd وَأَنتَand you اِمرُؤٌa man
فَأَبلِغ دُرَيداً وَأَنتَ اِمرُؤٌ
مَتىwhen ماever (emphasizing the condition) تُذَكِّرهُyou remind him يَستَذكِرُhe remembers
مَتى ما تُذَكِّرهُ يَستَذكِرُ
So tell Durayd—you are a man
So tell Duraid, though you're a man of note
Who remembers whenever he is reminded.
Whene'er you speak he will at once take note