In Hebrews 4:1, "let us fear" would be the translation of Φοβηθῶμεν according to the NA27 text. The Strong's number given in NASB95 and ESV interlinear mode is 5399 which when hovered over shows Dictionary of Biblical Languages entry 5828 φοβέομαι which is a middle deponent verb.
Why does this morphology search show no results?

My real goal is to find out all the uses this type of hortatory subjunctive with the verb "fear" but I can't get any results at all. Can anyone help me figure out how to do this search?
Just as an aside I don't understand why
- the NASB95 and ESV interlinears give Louw Nida number of 25.251, φόβος, which is a noun not a verb
- the morphology tag in the NASB95 and ESV interlinear mode indicates passive when the verb given in the DBL is middle deponent, and the passive voice doesn't make any sense in the context