Theophylact of Ohrid

There follows, And Jesus when he came out saw much people, and was moved with compassion towards them, because they were as sheep having no shepherd. The Pharisees being ravening wolves did not feed the sheep, but devoured them; for which reason they gather themselves to Christ, the true Shepherd, who gave them spiritual food, that is, the word of God. Wherefore it goes on, And he began to teach them many things. …

Catena Aurea by Aquinas ↗

Bede

And going out, Jesus saw a great crowd and had compassion on them, because they were like sheep without a shepherd, and he began to teach them many things. How He had compassion on them, Matthew explains more fully by saying: And He had compassion on them, and healed their sick. For this is truly to have compassion on the poor and those without a shepherd, to open the way of truth to them by teaching; and to remove bodily ailments by healing; but also to refresh the hungry, revitalizing them to the praise of divine generosity. …

On the Gospel of Mark ↗