رَجَعَا بِأَمْرِهِمَا إِلَى ذِي مِرَّةٍ ۞ حَصِدٍ وَنَجْحُ صَرِيمَةٍ إِبْرَامُهَا
Then the two resolved upon a firm, determined course: their decision required strength and its success lay in carrying it through.
Dhī mirratin ḥaṣid conveys strength and firmness of determination. Ṣarīmah means a resolved plan, and ibrām its firm conclusion. After prolonged thirst, desire alone is insufficient; a decision now becomes purposeful movement.