«يَا مَنْ غَدَا لِي سَاعِدًا / وَمُسَاعِدًا دُونَ الْبَشَرِ»
O you who became my support and helper above other people.
Sāʿidan / musāʿidan are related expressions of help and support. Their shared sound turns an acknowledgment of assistance into musical verse.
On the surface, Abū Zayd thanks al-Ḥārith for generosity. But the thanks arrives as a message after an escape, not with a loyal return. That tension between verbal gratitude and action is essential to the humour.