'Calling' in the Bible

I was in the Spirit [in special communication with the Holy Spirit and empowered to receive and record the revelation from Jesus Christ] on the Lord’s Day, and I heard behind me a loud voice like the sound of a trumpet,

After this I looked, and behold, a door standing open in heaven! And the first voice which I had heard, like the sound of a [war] trumpet speaking with me, said, “Come up here, and I will show you what must take place after these things.”

And the two witnesses heard a loud voice from heaven saying to them, “Come up here.” Then they ascended into heaven in the cloud, and their enemies watched them.

And another angel came out of the temple, calling with a loud voice to Him who was sitting upon the cloud, “Put in Your sickle and reap [at once], for the hour to reap [in judgment] has arrived, because the earth’s harvest is fully ripened.”