But, it IS the Father/God/Yahweh
Isa 49:26
And I will feed them that oppress thee with their own flesh; and they shall be drunken with their own blood, as with sweet wine: and all flesh shall know that I the LORD (3068) [am] thy Saviour and thy Redeemer , the mighty One (46) of Jacob.
from the Hebrew
46 'abiyr aw-beer' from 82; mighty (spoken of God):--mighty (one).
1) strong, mighty - used only to describe God
2) the Strong - old name for God (poetic) AV - might (One) 6; 6
from the Hebrew
3068 Yhovah yeh-ho-vaw' from 1961; (the) self-Existent or Eternal; Jehovah, Jewish national name of God:--Jehovah, the Lord. Compare 3050, 3069.
Jehovah = "the existing One"
1) the proper name of the one true God
a) unpronounced except with the vowel pointings of 0136
3050 Yahh yaw contraction for 3068, and meaning the same; Jah, the sacred name:--Jah, the Lord, most vehement. Compare names in "-iah," "- jah."
1) Jah (Jehovah in the shortened form)
a) the proper name of the one true God
b) used in many compounds
1) names beginning with the letters 'Je'
2) names ending with 'iah' or 'jah'
There is nothing within those definitions that indicate any trinity.
Isa 49:26
And I will feed them that oppress thee with their own flesh; and they shall be drunken with their own blood, as with sweet wine: and all flesh shall know that I the LORD [am] thy Saviour and thy Redeemer , the mighty One of Jacob.
Words have meanings. Yahweh could have said 'trinity' in that verse, but He DIDN'T, He said ONE.