The neighbor is the one who shows mercy
Clement is explaining the second great commandment, love of neighbor, and how Jesus defined the neighbor through the parable of the Good Samaritan.
He says the second commandment is not at all smaller than this one: “You shall love your neighbor as yourself.” So then, love God more than yourself. When the man he was speaking with asked, “Who is my neighbor?” he did not define it the way the Jews did—not the blood relative, not the fellow citizen, not the convert, not the one circumcised in the same way, not the one who uses one and the same law. Instead, he leads the discussion to a man going down from Jerusalem to Jericho, and shows him stabbed by robbers, thrown half-dead on the road, passed by a priest, overlooked by a Levite, but pitied by the Samaritan—the one reviled and set apart—who did not pass by as the others did by chance, but came equipped with what the man in danger needed: wine, oil, bandages, an animal, payment for the innkeeper—part given at once, part promised for later. “Which of these,” he said, “became a neighbor to the man who suffered these terrible things?” And when the man answered, “The one who showed mercy to him,” he said, “You go and do likewise,” since love sprouts good-doing.
Greek
Δευτέραν δὲ τάξει καὶ οὐδέν τι μικροτέραν ταύτης εἶναι
λέγει τό· »ἀγαπήσεις τὸν πλησίον σου ὡς σεαυτόν·« οὐκοῦν τὸν θεὸν ὑπὲρ σεαυτόν. πυνθανομένου δὲ τοῦ προσδιαλεγομένου »τίς ἐστιν πλησίον;« οὐ τὸν αὐτὸν τρόπον Ἰουδαίοις προωρίσατο τὸν πρὸς αἵματος οὐδὲ τὸν πολίτην οὐδὲ τὸν προσήλυτον οὐδὲ τὸν ὁμοίως περιτετμημένον οὐδὲ τὸν ἑνὶ καὶ ταὐτῷ νόμῳ χρώμενον· ἀλλὰ ἄνωθεν καταβαίνοντα ἀπὸ Ἱερουσαλὴμ ἄγει τῷ λόγῳ τινὰ εἰς Ἱεριχὼ καὶ τοῦτον δείκνυσιν ὑπὸ λῃστῶν συγκεκεντημένον, ἐρριμμένον ἡμιθνῆτα ἐπὶ τῆς ὁδοῦ, ὑπὸ ἱερέως παροδευόμενον, ὑπὸ Λευίτου παρορώμενον, ὑπὸ δὲ τοῦ Σαμαρείτου τοῦ ἐξωνειδισμένου καὶ ἀφωρισμένου κατελεούμενον, ὃς οὐχὶ κατὰ τύχην ὡς ἐκεῖνοι παρῆλθεν, ἀλλ᾿ ἧκε συνεσκευασμένος ὧν ὁ κινδυνεύων ἐδεῖτο, οἶνον, ἔλαιον, ἐπιδέσμους, κτῆνος, μισθὸν τῷ πανδοχεῖ, τὸν μὲν ἤδη διδόμενον, τὸν δὲ προσυπισχνούμενον. »τίς«, ἔφη, »τούτων γέγονε πλησίον τῷ τὰ δεινὰ παθόντι;« τοῦ δὲ ἀποκριναμένου ὅτι »ὁ τὸν ἔλεον πρὸς αὐτὸν ἐπιδειξάμενος· καὶ σὺ τοίνυν πορευθεὶς οὕτω ποίει«, ὡς τῆς ἀγάπης βλαστανούσης εὐποιίαν.