Al Roker's hangin' in there after the terrifying intruder incident at the "TODAY" show ... and he's got a profound message about the wild ordeal.

Al shared a sweet montage of photos with cohost Craig Melvin on Instagram Friday, set to Avicii's "Hey Brother" ... that included his powerful words.

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Al says ... "A really heartfelt thank you to all who reached out over the last 24 hours to check in on my brother, @craigmelvinnbc We are both okay."

The beloved weather anchor then proclaimed ... "It’s moments like these that serve to pull us together. You all, like Craig, said 'You come after one of us, you come after all of us.'"

We broke the story ... Andrew Truelove slipped past security at 30 Rock Thursday morning. Once inside, he was asking for Al ... but couldn't find him.

Instead, he zeroed in on Craig, allegedly lunging at him and yelling the n-word. He was sent to Rikers Island and is facing a bunch of hate crime charges.