Strongs Number: G5799
No Tense or
In a number of places certain verbs are cited in Perschbacher's "The New Analytical Greek Lexicon" which do not have any tense or voice directly stated.
In almost all of these cases, one can assume that the tense is Present and the voice is Active, especially when the sense is that of a command (Imperative).
See "Present" # G5784