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Fausset's Bible Dictionary
Condensing in one emphatic syllable all that is implied in Jahveh (or Υahweh ), the true pronunciation of Jehovah (Psalms 68:4); first in Exodus 15:2 (Hebrew). Often in names, as Εli-jah . Only in poetry: Isaiah 12:2, "Jah (or Υah ) Jehovah is my strength and my song"; (Isaiah 26:4) "in Jah (or Υah ) Jehovah is the Rock of ages." The union of the two names expresses in the highest degree God's unchanging love and power. Ηallelu-Jah (or Ηallelu-Υah ) is "Praise ye Jah (or Υah )". Psalms 89:8, "O Jehovah , God of hosts, who, as Thou, is a strong Jah (or Υah )?" the emphatic concentration of the name "Jehovah." The spirit impressed with a sense of God feels the need of repeating frequently that name in which His being is comprehended (Hengstenberg).
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Fausset, Andrew R. Entry for 'Jah'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/j/jah.html. 1949.