I'm very curious what exactly are you calling the plan of salvation presented to Moses?
The English word “salvation” first appear in Gen 49:18:
Genesis 49:18 (NKJV)
18 I have waited for your salvation, O LORD!
Jacob the first to overcome, is expecting deliverance and his salvation is timed by his death. In the OT four words are translated, “salvation”and typically mean deliverance, rescue and safety.
I need a working hypothesis and it goes like this; salvation was planned before creation and creation was the beginning of the implementation of the plan and the culmination of the plan is the Kingdom of God; everything to do with God, man and creation is to with redemption and salvation; there was a war in heaven; salvation is to restore all things; the Kingdom of God is redeemed from antiquity. What was given to the descendants of Abraham, the land and it's system of government in the guise of a covenant was a training model of the Kingdom of God
Psalm 25:3 (NKJV)
3 Indeed, let no one who waits on You be ashamed; Let those be ashamed who deal treacherously without cause.
Psalm 25:5 (NKJV)
5 Lead me in Your truth and teach me, For You
are the God of my salvation; On You I wait all the day.
Psalm 62:5 (NKJV)
5 My soul, wait silently for God alone, For my expectation
is from Him.
Psalm 119:166 (NKJV)
166 LORD, I hope for Your salvation, And I do Your commandments.
Psalm 119:174 (NKJV)
174 I long for Your salvation, O LORD, And Your law
is my delight.
Psalm 130:5 (NKJV)
5 I wait for the LORD, my soul waits, And in His word I do hope.
Isaiah 25:9 (NKJV)
9 And it will be said in that day: "Behold, this
is our God; We have waited for Him, and He will save us. This
is the LORD; We have waited for Him; We will be glad and rejoice in His salvation."
Isaiah 40:31 (NKJV)
31 But those who wait on the LORD Shall renew
their strength; They shall mount up with wings like eagles, They shall run and not be weary, They shall walk and not faint.
Lamentations 3:26 (NKJV)
26
It is good that
one should hope and wait quietly For the salvation of the LORD.