This is what you call an ‘idiom’ or an ‘idiomatic expression’. It is found in the King James Bible, and also in other books written about that time (around 1600). The English language was very flexible in those days, it was just developing into the language we speak today, so writers were very free in making up idioms and ‘figures of speech’. Shakespeare lived around that time also, and his writing is also full of things like this.

Lo! and behold! is an awe inspiring phrase, usually used to express “eureka” or “look at this,” and “I’ve found it!”

In other words, if something really makes you excited, or you found something you thought you’d never see again after looking for it, that’s what it means.

I would really like to see the people trying to find miners blocked down in that mine succeed in their quest. If they were alive and well, that would be a Lo! and behold! situation, indeed.

I do hope when you die and go to heaven, should you have faith in Jesus (and I’m not being trite) you’ll feel that way as you enter.