ἔσονται οἱ δύο εἰς σάρκα μίαν → they will become one flesh

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ἔσονται οἱ δύο εἰς σάρκα μίαν → they will become one flesh

εις σάρκα μίαν ("καί ἔσονται οἱ δύο εἰς σάρκα μίαν", Γένεσις 2,24): (θα είναι οι δύο) ένα σώμα. Λέγεται όταν η γυναίκα και ο άνδρας ενώνονται με τα δεσμά του γάμου
https://el.wiktionary.org/wiki/%CF%83%CE%B1%CF%81%CE%BE

23 And Adam said, This is now bone of my bones, and flesh of my flesh: she shall be called Woman, because she was taken out of Man.
24 Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh.
https://www.biblegateway.com/passage/?search=Genesis+2%3A23-24&version=KJV