Hebrews 10:22-25—three heads of "let us"

Years ago, I noticed something about the structure of this passage:

22 προσερχώμεθα μετὰ ἀληθινῆς καρδίας ἐν πληροφορίᾳ πίστεως ῥεραντισμένοι τὰς καρδίας ἀπὸ συνειδήσεως πονηρᾶς καὶ λελουσμένοι τὸ σῶμα ὕδατι καθαρῷ· 23 κατέχωμεν τὴν ὁμολογίαν τῆς ἐλπίδος ἀκλινῆ, πιστὸς γὰρ ὁ ἐπαγγειλάμενος, 24 καὶ κατανοῶμεν ἀλλήλους εἰς παροξυσμὸν ἀγάπης καὶ καλῶν ἔργων, 25 μὴ ἐγκαταλείποντες τὴν ἐπισυναγωγὴν ἑαυτῶν, καθὼς ἔθος τισίν, ἀλλὰ παρακαλοῦντες, καὶ τοσούτῳ μᾶλλον ὅσῳ βλέπετε ἐγγίζουσαν τὴν ἡμέραν.

Do you see it? There are three cohortatives in this passage (first person plural subjunctives, all present tense). In English, we use the phrase "let us." Hence, "Three Heads of 'Let Us.'"

See how I develop this, if you like, in this sermon [update: link's bad, trying to find out why; sorry.]