When Jesus returns how will be know it is him for sure?
Jesus assures us that his return will be unmistakeable.
Matthew 24:27 For as the lightning cometh out of the east, and shineth even unto the west; so shall also the coming of the Son of man be... 29 Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken: 30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory. 31 And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
Mark 13:24 But in those days, after that tribulation, the sun shall be darkened, and the moon shall not give her light, 25 And the stars of heaven shall fall, and the powers that are in heaven shall be shaken. 26 And then shall they see the Son of man coming in the clouds with great power and glory. 27 And then shall he send his angels, and shall gather together his elect from the four winds, from the uttermost part of the earth to the uttermost part of heaven.
Luke 17:24 For as the lightning, that lighteneth out of the one part under heaven, shineth unto the other part under heaven; so shall also the Son of man be in his day.
Those who have believed the gospel and have been baptised into Christ will be taken to him.
1 Thessalonians 4:17 Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
Luke 17:34 I tell you, in that night there shall be two men in one bed; the one shall be taken, and the other shall be left. 35 Two women shall be grinding together; the one shall be taken, and the other left. 36 Two men shall be in the field; the one shall be taken, and the other left.
From the description of some sleeping and some working we understand that they are taken from all over the world at the same time. They will be taken in the same way that Philip was taken from the Ethiopian to Azotus.
Acts 8:39 And when they were come up out of the water, the Spirit of the Lord caught away Philip, that the eunuch saw him no more: and he went on his way rejoicing. 40 But Philip was found at Azotus: and passing through he preached in all the cities, till he came to Caesarea.
I hope you have found this helpful.
May God bless you,