John Mark
Mark 13:10ESV·traditional attribution

And the gospel must first be proclaimed to all nations.

Matthew Henry Presbyterian @wholebiblehenry

Our Lord Jesus, in reply to their question, sets himself, not so much to satisfy their curiosity as to direct their consciences; leaves them still in the dark concerning the times and seasons, which the father has kept in his own power, and which it was not for them to know; but gives them the cautions which were needful, with reference to the events that...

Commenting on Mark 13:5-13

John Gill Reformed Baptist @doctorgill

And the Gospel must first be published among all nations. The Syriac version reads, "my Gospel"; the Gospel which Christ was the author, subject, and preacher of; this "must be published". There was a necessity of the promulgation of it by the will of God, the command and commission of Christ; and for the gathering in of the Jews, that were the elect of God...

Adam Clarke Methodist @methodicalclarke

And the Gospel must first be published among all nations. - Many of the Evangelistaria omit this verse. Its proper place seems to be after verse the thirteenth.