«حَتَّى إِذَا لَأْلَأَ الْأُفُقُ ذَنَبَ السِّرْحَانِ وَانْبَلَجَ الْفَجْرُ»
Until the horizon showed the first pale streak of dawn, daybreak opened, and it was time to take the road.
Dhanab al-sirḥān literally means a wolf’s tail and is used poetically for the streak of first light. Inbilāj al-fajr evokes dawn breaking through darkness. The richly visual transition from night talk to dawn is functional: it starts the moment at which Abū Zayd intends to escape.