Nouns modified by demonstrative pronouns are nearly always articular; the pronoun either preceding the article or following the noun.
John 3:2 …οὐδεὶς γὰρ δύναται ταῦτα τὰ σημεῖα ποιεῖν ἃ σὺ ποιεὶς, ἐὰν μὴ ᾖ ὁ θεὸς μετ’ αὐτοῦ.
John 1:39 λέγει αὐτοῖς· ἔρχεσθε καὶ ὄψεσθε. ἦλθαν οὖν καὶ εἶδαν ποῦ μένει καὶ παρ’ αὐτῷ ἔμειναν τὴν ἡμέραν ἐκείνην
John 3:29 … αὕτη οὖν ἡ χαρὰ ἡ ἐμὴ πεπλήρωται.