«فَشَحَذَ لِلرِّحْلَةِ»
So he sharpened his resolve for the journey.
Shaḥdh literally denotes sharpening an edge. Applied to the decision to travel, it suggests strengthening determination as one would prepare a blade for use.
The emotional point is important: affection for a friend may remain genuine even when economic conditions make departure unavoidable. The narrator presents hardship rather than a casual whim as the immediate cause.