Ἀββᾶ
From LSJ
θεὸς δ' ἁμαρτάνουσιν οὐ παρίσταται → God doesn't stand by those who do wrong → A peccatore sese numen segregat → Ein Gott steht denen, die da freveln, niemals bei
English (Strong)
of Chaldee origin (אַב); father as a vocative: Abba.
English (Thayer)
(WH (βά), Hebrew אָב father, in the Chaldean emphatic state, אַבָּא i. e. ὁ πατήρ, a customary title of God in prayer. Whenever it occurs in the N. T. (אַבָּא, through frequent use in prayer, gradually acquired the nature of a most sacred proper name, to which the Greek-speaking Jews added the appellative from their own tongue.