As far as I know, never. But I'm not completely sure.

You mean like in a trance of sorts? I am not aware of anywhere in the Holy Scriptures.

The idea, I think, comes from the Book of Revelation 1:17. In this chapter, John is taken to heaven, where he sees Jesus in his glory. His reaction: "When I caught sight of him, I fell down at his feet as though dead." The problem is that, if this is a proof text, it does not support the behaviour. The Greek says: 17και οτε ειδον αυτον επεσα προς τους ποδας αυτου ως νεκρος και εθηκεν την δεξιαν αυτου επ εμε λεγων μη φοβου εγω ειμι ο πρωτος και ο εσχατος The verb "επεσα'(epesa) is the word translated "I fell at...feet". It is the aorist form of the verb "pipto" . It is a significant verb because it means, according to Koine Greek experts 1) to descend from a higher place to a lower 1a) to fall (either from or upon) 1a1) to be thrust down 1b) metaph. to fall under judgment, came under condemnation 2) to descend from an erect to a prostrate position 2a) to fall down 2a1) to be prostrated, fall prostrate 2a2) of those overcome by terror or astonishment or grief or under the attack of an evil spirit or of falling dead suddenly 2a3) the dismemberment of a corpse by decay 2a4) to prostrate one's self 2a5) used of suppliants and persons rendering homage or worship to one 2a6) to fall out, fall from i.e. shall perish or be lost 2a7) to fall down, fall into ruin: of buildings, walls etc. 2b) to be cast down from a state of prosperity 2b1) to fall from a state of uprightness 2b2) to perish, i.e come to an end, disappear, cease 2b2a) of virtues 2b3) to lose authority, no longer have force 2b3a) of sayings, precepts, etc. 2b4) to be removed from power by death 2b5) to fail of participating in, miss a share in depending on where it is used. In general, though, you can see that the verb involves falling FORWARD or DOWN from an upright position TO A PROSTRATE position. It does not mean falling BACK. I know this is a common practice in many churches, but I don't think it has a Biblical base. Not that I say Don't do it. That is up to the denomination. But it should not be taught as a Biblical occurrence or practice, because it was not. (Apart from the obvious fact that Rev 1:7 is about worshipping Jesus, not being healed) Hope this helps.

I am not aware of it being anywhere in the Bible. I think Benny Hinn or somebody came up with that. -In Christ's service. Thank you and God bless you!

Nothing about laying of hands causing "slaying in the spirit". Closest scriptural context would be Rev. 1:17 and John 18:6

Underneath the part that says "kill the wabbit"

That's not in the Bible. That phrase originated in a Pentecostal church many years ago. A man in crutches went up front to be healed. He was told to throw the crutches away and walk. He fell and the preacher said he had been slain in the spirit.

A short answer would be that it is not found in Scripture. Most supposed "manifestations" experienced at certain revivals and evangelistic meetings, find no basis whatsoever in the Bible. If it's not found in Scripture then I doubt that it is from God because God cannot lie and will never go against His own Word.

It is sometimes considered one of the "manifestations" of the Spirit. I'm in Bible College and this question was asked to one of my professors. He said simply just isn't in the text. He said, "When looking at 'extrabiblical' manifestations of the Spirit, you have to ask yourself 3 questions. All are taken from 1 Corinthians 14. 1) Is it understood by everyone present [v16]? (i.e. tongues MUST have interpretation in group settings) 2) Is it done to edify [v17]? 3) Is it done in a fitting/proper and orderly way [v40]?" Everything must come back to the "litmus test" of Scripture. If it doesn't line up, we shouldn't be doing it. The question left to us is, "Does being slain in the Spirit line up with these statues the Bible sets up for Spirit manifestations?" It can get kinda gray and fuzzy sometimes. There are obvious things that are allowed and should be encouraged (those things that are in scripture.) But there are those that are gray (slain in the spirit, laughing in the spirit, etc.) And there are obvious NO's as well (barking in the spirit, stripping in the spirit, urinating/defecating in the spirit, etc.) Just remember what Paul said to the Thessalonians speaking about Spiritual gifts/manifestations. "Test everything! Hold onto the good and avoid the evil." (1 Thess. 5:21-22) Hope this helps! God bless!!