A.T. Robertson Commentary Hebrews 10:23

"let us hold fast the confession of our hope that it waver not; for he is faithful that promised:" — Hebrews 10:23 (ASV)

Let us hold fast (κατεχωμεν). Present (keep on holding fast) active volitive subjunctive of κατεχω as in 3:6,14.

That it waver not (ακλινη). Common compound adjective (alpha privative and κλινω, unwavering, not leaning, here only in N.T. It is a confession of hope, not of despair.

That promised (ο επαγγειλαμενος). First aorist middle articular participle of επαγγελλω. This is the argument remaining to be discussed (10:26-12:3) and already alluded to (6:13f.8:6). The ministry of Jesus rests upon "better promises." How better? God is "faithful," but he made the other promises also. We shall see.