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ὅταν λέγωσιν Εἰρήνη καὶ ἀσφάλεια, τότε αἰφνίδιος αὐτοῖς ἐπίσταται / ἐφίσταται ὄλεθρος ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ, καὶ οὐ μὴ ἐκφύγωσιν.

Nestle-Aland 28th
For when they shall say, Peace and safety; then sudden destruction comes upon them, as travail upon a woman with child; and they shall not escape. (KJV)
# Greek MAC & POS Definition
3752 ὅταν
 CONJ
 whenever
3004 λέγω
 V-PAS-3P
 to say
1515 εἰρήνη, ης, ἡ
 N-NSF
 one, peace, quietness, rest
2532 καί
 CONJ
 and, even, also
803 ἀσφάλεια, ας, ἡ
 N-NSF
 certainty, security
5119 τότε
 ADV
 then, at that time
160 αἰφνίδιος, ον
 A-NSM
 sudden
846 αὐτός, αὐτή, αὐτό
 P-DPM
 (1) self (emphatic) (2) he, she, it (used for the third person pronoun) (3) the same
1987 ἐπίσταμαι
 V-PNI-3S
 to know, to understand
2186 ἐφίστημι
 V-PMI-3S
 to set upon, set up, to stand upon, be present
3639 ὄλεθρος, ου, ὁ
 N-NSM
 destruction, death
5618 ὥσπερ
 ADV
 just as, even as
3588 ὁ, ἡ, τό
 T-DSF
 the
5604 ὠδίν, ῖνος, ἡ
 N-NSF
 a birth pang
1722 ἐν
 PREP
 in, on, at, by, with
1064 γαστήρ, γαστρός, ἡ
 N-DSF
 the belly
2192 ἔχω
 V-PAP-DSF
 to have, hold
3756 οὐ
 PRT-N
 not, no
3361 μή
 PRT-N
 not, that...not, lest (used for qualified negation)
1628 ἐκφεύγω
 V-2AAS-3P
 to flee away

version verse
Berean Greek NT 2016 ὅταν λέγωσιν “Εἰρήνη καὶ ἀσφάλεια,” τότε αἰφνίδιος αὐτοῖς ἐφίσταται* ὄλεθρος ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ, καὶ οὐ μὴ ἐκφύγωσιν.
SBL Greek NT 2010 ὅταν λέγωσιν· Εἰρήνη καὶ ἀσφάλεια, τότε αἰφνίδιος αὐτοῖς ἐφίσταται ὄλεθρος ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ, καὶ οὐ μὴ ἐκφύγωσιν.
Nestle Greek NT 1904 ὅταν λέγωσιν Εἰρήνη καὶ ἀσφάλεια, τότε αἰφνίδιος αὐτοῖς ἐπίσταται ὄλεθρος ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ, καὶ οὐ μὴ ἐκφύγωσιν.
Westcott & Hort 1881 ὅταν λέγωσιν Εἰρήνη καὶ ἀσφάλεια, τότε αἰφνίδιος αὐτοῖς ἐπίσταται ὄλεθρος ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ, καὶ οὐ μὴ ἐκφύγωσιν.
Nestle-Aland 27th ὅταν λέγωσιν Εἰρήνη καὶ ἀσφάλεια, τότε αἰφνίδιος αὐτοῖς ἐπίσταται / ἐφίσταται ὄλεθρος ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ, καὶ οὐ μὴ ἐκφύγωσιν.
Nestle-Aland 28th ὅταν λέγωσιν Εἰρήνη καὶ ἀσφάλεια, τότε αἰφνίδιος αὐτοῖς ἐπίσταται / ἐφίσταται ὄλεθρος ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ, καὶ οὐ μὴ ἐκφύγωσιν.
RP Byzantine Majority Text 2005 ὅταν γὰρ λέγωσιν, Εἰρήνη καὶ ἀσφάλεια, τότε αἰφνίδιος αὐτοῖς ἐφίσταται ὄλεθρος, ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ, καὶ οὐ μὴ ἐκφύγωσιν.
Greek Orthodox Church 1904 ὅταν λέγωσιν, εἰρήνη καὶ ἀσφάλεια, τότε αἰφνίδιος αὐτοῖς ἐφίσταται ὄλεθρος, ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ, καὶ οὐ μὴ ἐκφύγωσιν.
Tiechendorf 8th Edition 1872 ὅταν λέγωσιν, εἰρήνη καὶ ἀσφάλεια, τότε αἰφνίδιος αὐτοῖς ἐπίσταται ὄλεθρος ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ, καὶ οὐ μὴ ἐκφύγωσιν.
Scrivener's Textus Receptus 1894 ὅταν γὰρ λέγωσιν, Εἰρήνη καὶ ἀσφάλεια, τότε αἰφνίδιος αὐτοῖς ἐφίσταται ὄλεθρος, ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ, καὶ οὐ μὴ ἐκφύγωσιν.
Sthephanus Textus Receptus 1550 ὅταν γὰρ λέγωσιν Εἰρήνη καὶ ἀσφάλεια τότε αἰφνίδιος αὐτοῖς ἐφίσταται ὄλεθρος ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ καὶ οὐ μὴ ἐκφύγωσιν
Beza Greek NT 1598 Ὅταν γὰρ λέγωσιν, Εἰρήνη καὶ ἀσφάλεια· τότε αἰφνίδιος αὐτοῖς ἐφίσταται ὄλεθρος, ὥσπερ ἡ ὠδὶν τῇ ἐν γαστρὶ ἐχούσῃ· καὶ οὐ μὴ ἐκφύγωσιν.