Ex. 3:15 -
Jehovah [YHWH], .... This is My name forever, and this is My memorial from generation to generation. - LITV (Green)
“Jehovah, .... This is My name forever and by this I am to be remembered through all generations.” - MLB.
“Jehovah ... This is my eternal name, to be used throughout all generations.” - LB.
“Jehovah ... this is my name forever.” - Byington.
"Jehovah, ... this is my name forever” - ASV.
“Jehovah, .... This is my name for ever, and this is my memorial unto all generations.” - Darby.
“Yahweh [YHWH] .... This is my name for all time, and thus I am to be invoked for all generations to come.” - JB & NJB.
.................................
1 Chron. 16:8 -
“O give thanks unto Jehovah, call upon his name; Make known his doings among the peoples.” - ASV.
“Give thanks to Yahweh, call his name aloud, proclaim his deeds to the peoples [‘among the nations’ - NAB (1991); MLB; GNB; ‘world’ - LB].” - NJB.
“O give thanks to Jehovah, call upon His name” - KJIIV.
“Give thanks to Jehovah, call in His name” - Young’s.
“... call upon him by his name” - The Septuagint, Zondervan Publ., 1970.
...................................
Is. 12:4 -
“And in that day shall ye say, Give thanks unto Jehovah, call upon his name, declare his doings among the peoples, make mention that his name is exalted.” - ASV.
“And, that day, you will say, ‘Praise Yahweh, invoke his name. Proclaim his deeds to the people [‘nations’, RSV, NRSV, MLB, NAB (1991), GNB; ‘world’, LB], declare his name sublime.’” - NJB.
“call his name aloud.” - JB.
“invoke him by name” - NEB & REB.
“call aloud upon his name” [Boate to onoma autou, literally: “call aloud his name”] - The Septuagint, Zondervan Publ., 1970.
..................................
Zeph. 3:9 - “For then will I turn to the peoples a pure language, that they may all call upon the name of Jehovah, to serve him with one consent.” - ASV.
“Yes, then [the last days] I shall purge the lips of the peoples, so that all may invoke the name of Yahweh.” - NJB, c.f. JB.
..................................
Joel 2:26, 32 - “And ye ... shall praise the name of Jehovah your God .... And it shall come to pass, that whosoever shall call on the name of Jehovah shall be delivered.” - ASV.
“You WILL ... praise the name of Yahweh your God .... All who call on [‘invoke’ - REB] the name of Yahweh will be saved” - NJB.
Here, like knowing God (Jn 17:3; 2 Thess. 1:8, 9), calling on (or invoking) Jehovah’s name is an essential part of the road that leads to life.
Since it is a requirement to call upon, or invoke the name Jehovah, the knowledge and use of that name IS essential (as made known in the OT at least)! And, like knowing God, “calling upon his name, Jehovah” includes much more than merely pronouncing his name aloud in prayer. But, nevertheless, it does include the knowledge and use of his personal name, YHWH/Jehovah (or Yahweh).
For example, Elijah, in his famous demonstration of who the only true God is, told the priests of Baal, “Call on the name of your god, and I will call on the name of Jehovah: and the God that answers by fire, let him be God.”
So how did the priests of Baal call on the name of their god?
“And they ... called on the name of Baal ... saying ‘O Baal, hear us.’”
And how did Elijah call on the name of Jehovah? “O Jehovah .... Hear me, O Jehovah, hear me, that this people may know that thou, Jehovah, art God.... And when all the people saw it, they fell on their faces: and they said [aloud, uncoded, in plain language], ‘Jehovah, he is God’” - ASV, 1 Ki.18:24, 26, 36-39. - Obviously, calling on (or invoking) the name of Jehovah includes the reverent use of that only personal name of the true God!
Many other scriptures throughout the OT declare the extreme importance (to God and us) of our knowing and declaring and calling upon the name Jehovah/Yahweh/Yehowah:
.................................
Jer. 16:19, 21 -
“O Jehovah ... unto thee shall the nations come from the ends of the earth, and shall say, Our fathers have inherited nought but lies ... and they will know that my name is Jehovah.” - ASV.
“and they shall know that My name is Jehovah.” - KJIIV & MKJV.
“and they will be certain that my name is [Jehovah].” - BBE.
“and they shall know that my name is Jehovah.” - Darby.
“and they shall know that my name is JEHOVAH.” - Webster.
“and they shall learn that My name is [Jehovah]. – Tanakh.
................................