As you do know, much of Rev. is signified/coded by the angel, who received the words of Rev. to give to John. Therefore the 3.5 days is not to be taken literal but rather figurative, which is meaning the 3.5 years of the Joint ministry of John the Baptist for 6 mos. and Jesus for 3.0 years.
Because both were born having the Holy Spirit, no one could "suffer"/cause them to be kept in a grave. Spiritually, they NEVER died, whereas everyone who does die, having NOT the Gift of the Holy Spirt, "shall surely die", forever.
1 Cor. 2
12 Now we have received, not the spirit of the world, but the spirit which is of God; that we might know the things that are freely given to us of God.
13 Which things also we speak, not in the words which man's wisdom teacheth, but which the Holy Ghost teacheth; comparing spiritual things with spiritual.
The (Two Witnesses) will have literal bodies that die, and lay in a literal Jerusalem street for 3.5 literal days as a literal world watches their dead bodies, this literal unsaved worlds population will exchange literal gifts with one another celebrating their deaths because the (Two Witnesses) have tormented the wicked world through literal plagues brought by themselves, a complete "Future" literal remake of Moses/Aaron against Pharaoh of Egypt for 1260 literal days
After the (Two Witnesses) are literally raised to heaven in the sight of the unsaved world a literal great earthquake takes place in Jerusalem as the 2nd woe is complete, the 3rd woe takes place in the 7th Angel/Trump sounding (The End) as the final judgment takes place in Rev 11:18
Jesus Is The Lord
(Future Literal Events Unfulfilled)
Revelation 11:3-19KJV
3 And
I will give power unto my two witnesses, and
they shall prophesy a thousand two hundred and threescore days, clothed in sackcloth.
4 These are the two olive trees, and the two candlesticks standing before the God of the earth.
5 And if any man will hurt them, fire proceedeth out of their mouth, and devoureth their enemies: and if any man will hurt them, he must in this manner be killed.
6
These have power to shut heaven, that it rain not in the days of their prophecy: and have power over waters to turn them to blood, and to smite the earth with all plagues, as often as they will.
7 And when they shall have finished their testimony,
the beast that ascendeth out of the bottomless pit
shall make war against them, and shall overcome them, and kill them.
8 And
their dead bodies shall lie in the street of the great city, which spiritually is called Sodom and Egypt,
where also our Lord was crucified.
9 And
they of the people and kindreds and tongues and nations shall see their dead bodies three days and an half, and shall not suffer their dead bodies to be put in graves.
10 And
they that dwell upon the earth shall rejoice over them, and make merry, and shall send gifts one to another; because these two prophets tormented them that dwelt on the earth.
11 And after three days and an half the spirit of life from God entered into them, and
they stood upon their feet; and great fear fell upon them which saw them.
12 And they heard a great voice from heaven saying unto them, Come up hither. And they ascended up to heaven in a cloud; and their enemies beheld them.
13 And
the same hour was there a great earthquake, and the tenth part of the city fell, and in the earthquake were slain of men seven thousand: and the remnant were affrighted, and gave glory to the God of heaven.
14 The second woe is past; and, behold, the third woe cometh quickly.
15 And
the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of his Christ; and
he shall reign for ever and ever.
16 And the four and twenty elders, which sat before God on their seats, fell upon their faces, and worshipped God,
17 Saying, We give thee thanks, O Lord God Almighty, which art, and wast, and art to come; because thou hast taken to thee thy great power, and hast reigned.
18 And
the nations were angry, and thy wrath is come, and the time of the dead, that they should be judged, and that thou shouldest give reward unto thy servants the prophets, and to the saints, and them that fear thy name, small and great; and shouldest destroy them which destroy the earth.
19 And the temple of God was opened in heaven, and there was seen in his temple the ark of his testament: and there were lightnings, and voices, and thunderings, and an earthquake, and great hail.