«وَلَا أُفْرِغُ ثَنَائِي عَلَى مَنْ يُفْرِغُ إِنَائِي»
I do not pour out praise on someone who empties my vessel.
Thanāʾ means praise; ināʾ is a vessel. Their close rhyme gives a tangible image: praise seems like a liquid being poured, while the emptied vessel represents loss or exploitation.
The same verb, ufrighu / yufrighu, appears with different objects. This grammatical parallel intensifies the irony: the speaker refuses to fill another with compliments when that person empties his supplies.