Revelation 11:3-4

 "And behold, I am coming quickly. 

Blessed is he who heeds the words of the prophecy of this book."     

Revelation 22:7  NASB

"And I will appoint my two witnesses, and they will prophesy for 1,260 days, clothed in sackcloth." They are "the two olive trees" and the two lampstands, and "they stand before the Lord of the earth." 

And I will appoint my two witnesses 
Revelation 1:5  ... and from Jesus Christ, who is the faithful witness, the firstborn from the dead, and the ruler of the kings of the earth.
Revelation 2:13  ... and among the lampstands was someone like a son of man, dressed in a robe reaching down to his feet and with a golden sash around his chest.

and they will prophesy for 1,260 days 
Revelation 11:2  "But exclude the outer court; do not measure it, because it has been given to the Gentiles. They will trample on the holy city for 42 months (1,260 days).

clothed in sackcloth 
Genesis 37:34  Then Jacob tore his clothes, put on sackcloth and mourned for his son many days.
2 Samuel 3:31  Then David said to Joab and all the people with him, "Tear your clothes and put on sackcloth and walk in mourning in front of Abner." King David himself walked behind the bier.
Nehemiah 9:1  On the twenty-fourth day of the same month, the Israelites gathered together, fasting and wearing sackcloth and putting dust on their heads.
Jonah 3:5  The Ninevites believed God. A fast was proclaimed, and all of them, from the greatest to the least, put on sackcloth. 

They are the two olive trees 
Psalm 52:8  But I am like an olive tree flourishing in the house of God; I trust in God's unfailing love for ever and ever.
Jeremiah 11:16  The LORD called you a thriving olive tree with fruit beautiful in form. But with the roar of a mighty storm he will set it on fire, and its branches will be broken.
Zechariah 4:11  "Also there are two olive trees by it, one on the right of the bowl and the other on its left."
Zechariah 4:11  Then I asked the angel, "What are these two olive trees on the right and on the left of the lampstand?"

and they stand before the Lord of the earth 
Zechariah 4:14  So he said, "These are the two who are anointed to serve the Lord of all the earth."

(parentheses are mine)

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. 
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