نُبِّئْتُ عَمْرًا غَيْرَ شَاكِرِ نِعْمَتِي وَالْكُفْرُ مَخْبَثَةٌ لِنَفْسِ الْمُنْعِمِ
I was told that ʿAmr does not appreciate my favour; ingratitude can sour even the benefactor’s spirit.
Nubbiʾtu is a passive past: “I was informed.” The poem moves from one reported failure to acknowledge a favour to a general observation about ingratitude. Here kufr is the denial of a favour, not a theological verdict on the person named ʿAmr.