“Because you are his children, God has sent the Spirit of his Son into your hearts, crying, “Abba! Father!” (Gal. 4:6). Note here the Spirit does not cry out using “esoteric” or magical names for God, nor does the Spirit refer to one of God’s many titles based on the divine attributes, but instead uses a term of intimacy and profound trust. After all, the word “abba” (אַבָּא) is not so much a name for God as it is a claim about who you are — it is a confession that you belong to the Lord as his beloved child…
It has been noted that throughout his ministry Yeshua referred to the LORD simply as his “Father” though he used the intensive address “Abba, Father” (Ἀββᾶ, ὁ πατήρ) just before his arrest and crucifixion, that is, during his intercession at Gethsamane (גַּת שְׁמָנִים), near the olive oil press on the Mount of Olives where the anointing oil for the Temple (שֶׁמֶן הַמִּשְׁחָה) was made, and therefore he called upon “Abba, Father” while in deep suffering and tribulation of heart (Mark 14:36). “Take this cup away from me. Yet not what I will, but what you will…” The mixed dialect of Hebrew and Greek here (i.e., Ἀββᾶ, ὁ πατήρ) may indicate identification with both the Jewish people and the Gentiles who would be united in his passion, as it says, shalom shalom la’rachok vela’karov: “Peace, peace, to him who is far off and to him who is near,” says the LORD; “and I will heal him” (Isa. 57:19, Eph. 2:15). Knowing God as your “father” is a matter of the heart, an inner cry or groan coming from the miracle of spiritual rebirth. “The Spirit himself bears witness to our spirit that we are God’s children” (Rom. 8:16).
…
…