1And in that day thou shalt say:
‘I will give thanks unto Thee, O LORD;
For though Thou was angry with me,
Thine anger is turned away, and Thou comfortest me.
2Behold, God is my salvation;
I will trust, and will not be afraid;
For GOD the LORD is my strength and song;
And He is become my salvation.’
3Therefore with joy shall ye draw water
Out of the wells of salvation.
4And in that day shall ye say:
‘Give thanks unto the LORD, proclaim His name,
Declare His doings among the peoples,
Make mention that His name is exalted.
5Sing unto the LORD; for He hath done gloriously;
This is made known in all the earth.
6Cry aloud and shout, thou inhabitant of Zion,
For great is the Holy One of Israel in the midst of thee.’THE HOLY SCRIPTURES ACCORDING TO THE MASORETIC TEXT A NEW TRANSLATION Jewish Publication Society 1917
For some christians, Isaiah 12 is a prophecy about the coming of Yeshua (aka Jesus). For the Karaite Jews, this is just another name of YHWH, that is salvation.
Reading from the Orthodox Jewish Bible, it is easy to supposed why some christians claim that Jesus (Yeshua in Hebrew) is prophesied in Isaiah 12:
Yeshayah 12Orthodox Jewish Bible (OJB)
12 And in Yom Hahu thou shalt say, Hashem, I will praise Thee; though Thou wast angry with me, Thine anger is turned away, and Thou comfortedst me.
2 Hinei, El is my Yeshuah (Salvation); I will trust, and not be afraid; for Hashem G-d is my strength and my zemirah; He also has become my Yeshuah (Salvation).
3 Therefore with sasson shall ye draw mayim out of the wells of Yeshuah (Salvation).
4 And in Yom Hahu shall ye say, Hodu LaHashem, call upon Shmo, declare His deeds among the peoples, proclaim that Shmo is exalted.
5 Sing unto Hashem; for He hath done glorious things; let this be known b’chol ha’aretz.
6 Cry out and shout for joy, thou inhabitant of Tziyon; for gadol is Kadosh Yisroel in the midst of thee.
It is then for you to judge if Isaiah 12 is in fact a prophecy of the Yeshua who christians know as Jesus. Or is Isaiah 12 just another title or name address to YHWH? If it is indeed a prophecy of the coming messiah, is it Jesus christ or another messiah who is yet to come that meets the jewish criteria of a messiah?