Theophylact of Ohrid

And that He said this truly as a reproach, listen to what He says next: "Rise, let us go." He says this not in order to flee, but to go meet the enemies.

Commentary on Mark ↗

Bede

Rise up, let us go. Behold, he who betrays me is at hand. After praying a third time, and commanding the fear of the apostles, followed by penance, to be corrected, secure in His passion, He proceeds to His persecutors, and voluntarily offers Himself to be killed, saying to the disciples: Rise up, let us go. Behold, he who betrays me is at hand. Let him not find us as fearful and hesitant, but let us go to death willingly, so they may see our confidence and joy in suffering.

On the Gospel of Mark ↗