ὃ σὺ μισεῖς ἑτέρῳ μὴ ποιήσεις → don't do to others what you don't want them to do to you
3ᵉ sg. sbj. prés. de εἶμι.
ἴῃ: 3 л. sing. praes. conjct. к εἶμι.
