1 John 5:1

Πᾶς ὁ πιστεύων ὅτι Ἰησοῦς ἐστιν ὁ Χριστός, ἐκ τοῦ Θεοῦ γεγέννηται· καὶ πᾶς ὁ ἀγαπῶν τὸν γεννήσαντα ἀγαπᾷ καὶ τὸν γεγεννημένον ἐξ αὐτοῦ.

RBT Greek Interlinear:

Strongs 3956; Pas; Πᾶς; all; Adj-NMS

Strongs 3588; ho; ὁ; the; Art-NMS

Strongs 4100; pisteuōn; πιστεύων; he who trusts; V-PPA-NMS

Strongs 3754; hoti; ὅτι; that; Conj

Strongs 2424; Iēsous; Ἰησοῦς; Salvation; N-NMS

Strongs 1510; estin; ἐστιν; is; V-PIA-3S

Strongs 3588; ho; ὁ; the; Art-NMS

Strongs 5547; Christos; Χριστὸς; Christ; N-NMS

Strongs 1537; ek; ἐκ; from out; Prep

Strongs 3588; tou; τοῦ; the; Art-GMS

Strongs 2316; Theou; Θεοῦ; God; N-GMS

Strongs 1080; gegennētai; γεγέννηται; has been born; V-RIM/P-3S

Strongs 2532; kai; καὶ; and; Conj

Strongs 3956; pas; πᾶς; all; Adj-NMS

Strongs 3588; ho; ὁ; the; Art-NMS

Strongs 25; agapōn; ἀγαπῶν; he who agape-loves; V-PPA-NMS

Strongs 3588; ton; τὸν; the; Art-AMS

Strongs 1080; gennēsanta; γεννήσαντα; he who has begotten; V-APA-AMS

Strongs 25; agapa; ἀγαπᾷ; is agape-loving; V-PIA-3S

Strongs 2532; kai; ‹καὶ›; and; Conj

Strongs 3588; ton; τὸν; the; Art-AMS

Strongs 1080; gegennēmenon; γεγεννημένον; that which has been born; V-RPM/P-AMS

Strongs 1537; ex; ἐξ; from out; Prep

Strongs 846; autou; αὐτοῦ; himself; PPro-GM3S

RBT Translation:

Every one who is trusting that he is Salvation, the Anointed One,⁶ has been begotten from out of the God, and every one who is agape-loving the one who has begotten, is agape-loving the one who has been begotten from out of himself!

Mutuality
"And mighty ones is saying, 'I have given to yourselves here all the self eternal grass of a seed seed, who is upon the faces of the entire Earth, and the entire Tree whom within himself is the fruit of a tree of a seed seed to yourselves, he is food.'"

(Genesis 1:29 RBT)

LITV Translation:
Everyone who believes that Jesus is the Christ has been born of God. And everyone who loves Him who begets also loves the one who has been born of Him.

ESV Translation:
Everyone who believes that Jesus is the Christ has been born of God, and everyone who loves the Father loves whoever has been born of him.

Footnotes

6

Is that Legal?

Greek Πᾶς ὁ πιστεύων ὅτι ἐστιν Ἰησοῦς ἐστιν ὁ Χριστός

It is legal, and it is a relatively standard order in Koine Greek. But specifically with the verb "to be" ?

ὁ ἄνθρωπος Γαλιλαῖός ἐστιν. Luke 23:6

"the man a Galilean he is."

The sentence in Luke 23:6 is translated as "The man is a Galilean." Greek word order is flexible with the verb often appearing after the subject and adjective. Subject + Predicate Adjective + Verb.

Ἔρημός ἐστιν ὁ τόπος Mark 6:35

"Desolate is the Place"

This is written "backwards" from how it would be translated into English, "The Place is Desolate" 

In the case of subject nouns, a sentence like ὁ ἄνθρωπος ὁ βασιλεὺς ἐστιν ("The man the king he is"), ὁ βασιλεὺς ("the king") is the second noun (which is also in the nominative case and refers to the same subject as ὁ ἄνθρωπος), and the verb ἐστιν follows after the second noun. The translation, "the man is the king." 

Βασιλεὺς Ἰσραήλ ἐστιν. Matthew 27:42

A king of Israel he is. 

ὥστε κύριός ἐστιν ὁ Υἱὸς τοῦ ἀνθρώπου... Mark 2:28

"so a lord he is, the Son of the Man..."

All the translations translate the order of these words in reverse, "So the Son of Man is Lord..."