Jerome

Then Jesus said to them, 'Do not be afraid. And in the old and new Testament, this must always be observed: that when a more august (or narrower) vision appears, fear is first dispelled so that, with the mind calmed, the things that are said can be heard.' Go, tell my brothers to go to Galilee, there they will see me. And when they had gone, behold, some of the guards came into the city and reported to the chief priests all that had happened. …

Commentary on Matthew ↗

Hilary of Poitiers

The same order as of old now followed in the reversal of our woe, that whereas death began from the female sex, the same should now first see the glory of the Resurrection, and be made the messenger thereof. Whence the Lord adds, Go tell my brethren that they go into Galilee, there shall they see me.

Catena Aurea by Aquinas ↗

Thomas Aquinas

Next the office of announcing is enjoined. And where he does this, first he dispels fear; second, he enjoins the office, at go, tell my brethren. He says therefore then Jesus said to them: fear not. And this was fittingly done, because those who are appointed to the office of preaching should not fear; hence the Lord, sending his disciples, said: fear not. Now fear is twofold, namely servile and initial, and the latter is good; Ps. 118:120: pierce thou my flesh with thy fear. …

Commentary on Matthew ↗