What gave special force to the oath of an angel?

Answer

"And the angel which 1 saw stand upon the sea and upon the earth lifted up his hand to heaven, and sware
by Him that liveth for ever and ever, who created heaven, and the things that therein are, and the earth, and
the things that therein are, and the sea, and the things which are therein, that there should be time no
longer." Rev. 10: 5, 6.

By what means did Herod seek to destroy Christ?
After Pentecost, how was the gospel preached?
How is the church of the last days described?
What did the apostles say to the idolaters at Lystra?
Who is Lord of the Sabbath?
What were these locusts said to have over them?
24. What psalms seem to have been written especially for the comfort and encouragement of God's people during the time of the seven last plagues?

Questions & Answers are from the book Bible Readings for the Home Circle