ABBA

 
Father
And he said, Abba, Father, all things are possible unto thee; take away this cup from me: nevertheless not what I will, but what thou wilt. (Mark 14:3636And he said, Abba, Father, all things are possible unto thee; take away this cup from me: nevertheless not what I will, but what thou wilt. (Mark 14:36))
For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father. (Romans 8:1515For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father. (Romans 8:15))
And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father. (Galatians 4:66And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father. (Galatians 4:6))