ABBA
Aramaic word that Jesus frequently uses to address the Father (Mark 14:36). The first generation Christians also used it (Rom. 8:15; Gal. 4:6) to express a very intimate relationship between God and his children.
The Lord Jesus probably used this word many times, even in some cases where the biblical passages have transmitted the Greek version: “Father,” “My Father,” and also “my Father.”
It is an expression of full trust and adherence to the will of the Father, which Jesus wants to communicate to his disciples. The word does not appear in the secular or rabbinic literature of the time, and is characteristic of the vocabulary of Christ.
In the gospels it is always used accompanied by its respective translation with the word “Father.” It is only through Christ that we receive the spirit of adoption and learn to call God “Our Father” (Judges 11:2: John 17:11; 20:17).
The word was only used in colloquial language before Jesus. In the Old Testament it appears in several Hebrew names as a radical, for example: Abimelech, Abner, Ardenago, Eliab.