Mark 13:32 ‘But of that day and that hour knows no man, no not even the angels which are in heaven, neither the Son but the Father”
The bible is a Jewish book, written by Jewish writers within a Jewish culture. This was a Jewish saying. Jesus is referring to a specific Jewish festival –the feast of trumpets. All other Jewish festival fall on the full moon except one-the feast of trumpets starts on the 1st day of the new moon. Before the priest would announce the feast, he would send two witnesses to look out for the new moon. If they have not sighted the new moon they would come back and say “but of that day or hour no one knows”
In the book of Daniel and Revelation where we are given the exact timing of his return. Jesus was familiar with the book of Daniel. He quoted from it in his Olivet discourse. From the time the man of sin appears in the temple, there will be 1260 days.
His disciples understood what Jesus meant. Jesus was in fact telling them that he is returning on the feast of trumpets.
The blowing of trumpets in Joshua is connected with the blowing of trumpets in Revelation 11:15. When the 7th angel sounds the 7th trumpets, there were great voices in heaven saying, the kingdoms of this world are become the kingdom of our Lord and of His Christ and He shall reign for ever and ever.
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