Albert Barnes on Matthew 9:36

Because they fainted. The word used here refers to the weariness and fatigue which results from labour and being burdened. He saw the people burdened with the rites of religion and the doctrines of the Pharisees; sinking down under their ignorance and traditions, and neglected by those who ought to have been enlightened teachers, scattered and driven out without care and attention. With great beauty, he compares them to sheep wandering without a shepherd. Judea was a land of flocks and herds. The faithful shepherd, by day and night, was with his flock, He defended it, led it to green pastures, and beside the still waters. Without his care they would stray away. They were in danger of wild beasts. They panted in the summer sun, and knew not where was the cooling shade and stream. So, said he, is it with this people. No wonder that the compassionate Redeemer Was moved with pity!

(1) "they fainted" or, "were tired and laid down" (q) "having no shepherd" Nu 27:17, 1Kgs 22:17, Eze 34:5, Zech 10:2