1)
Why will he eat amidst trembling?
1.
Radak: The body will shake. This is like "va'Yirgaz ha'Melech" (Shmuel II, 19:1).
2.
Malbim (18-19) He commanded him to this way, like one who fears the enemy and worries lest his bread be finished. It is a sign that at the time pf the siege, they will eat their food amidst worry.
