"προσέχετε δὲ τὴν δικαιοσύνην ὑμῶν μὴ ποιεῖν ἔ̓́μπροσθεν τῶν ἀνθρώπων πρòς τò θεαθῆναι αὐ̓τοῖς εἰ δὲ μή γε μισθòν οὐκ ἔ̓́χετε παρὰ τῷ πατρὶ ὑ̔μῶν τῷ ἐν τοῖς οὐρανοῖς"

I encountered this verse and could not find any reference to "prosecho" being used with the acc + inf construction. I looked through LSJ and found the definition "take heed" but not the construction. What usage of the infinitive would you classify this as? Objective infinitive after a verb of cautioning?