So i've been going through "Teach yourself Irish" and agree that the best way to learn Irish is to go through a good grammer/textbook. That being said, It's going to be a long time before I'm fluent, and I want to continue memorizing/understanding scripture as I work through the book.

James 4:8
Draw close to God, and he will draw close to you.
Wash your hands, sinners, and cleanse your hearts,
you people who are between two minds.

Druidigh le Dia, agus druidfidh seisean libh.
Nígí bhur lámha, a pheacacha, agus glanaigí bhur gcroithe,
a dhaoine atá idir dhá intinn.

So,
nigh (wash)
glan (clean)

Can somebody explain the suffixes/form of these verbs above (glanaigí, Nígí)? Are they in the future tense? Is there some more advanced grammar rule occurring in this context because an order is being given?

Thanks in advance

Imperative 2nd person plural

In the Munster Irish you're learning, you'd expect and ending like -íg or -idh here instead of -igí. Dillon and Ó Cróinín cover this on page 142, and you can see they use the -idh ending for 2nd plural. So, following them, you could read instead Nídh bhur lámha and glanaidh bhur gcroithe.