«ثُمَّ إِنَّهُ وَدَّعَنِي وَمَضَى وَأَوْدَعَ قَلْبِي جَمْرَ الْغَضَى»
Then he bade me farewell, left, and deposited in my heart the burning embers of ghaḍā.
Al-ghaḍā denotes a tree whose wood is associated in Arabic literary usage with long-burning embers; jamr is glowing coal. Awdaʿa qalbī pictures pain as an object left inside the heart.
Abū Zayd departs with laughter, but the narrator is left with the sting of betrayed trust and wounded pride. The closing metaphor conveys pain that continues after the encounter has ended.