فَقَبِلَهُ مِنْهُمْ مُغْضِيًا وَأَثْنَى عَنْهُمْ مُثْنِيًا
He accepted their gift with his gaze lowered, then turned away while praising them.
Qabila and athnā are past-tense verbs. Mughḍiyan and muthniyan are circumstantial accusatives: the first describes how he receives the gift; the second says he is praising as he departs.
In this construction athnā ʿanhum means departing, not merely praising. The echo with muthniyan creates a subtle play on similar forms with distinct senses.