The OT stresses that God alone is immortal and indicates that this gift may be granted to human beings under certain conditions.

Psalms 90:2

Immortality is an attribute of God

See also

God is everlasting in himself

Nehemiah 9:5
Psalms 41:13
Isaiah 9:6; 40:28
Habakkuk 1:12
Deuteronomy 33:27

God is everlasting in his character and actions

Genesis 9:16; 17:7,13,19

The way in which Scripture emphasises the character of God in these contexts shows that immortality is about a quality of being as well as about infinite duration.

1 Chronicles 16:17

The everlasting covenant:

Psalms 9:7; 10:16; 132:12

pp Ps 105:10

Daniel 7:14,27

God's everlasting rule:

Psalms 52:8; 103:17
Isaiah 54:10

God's unfailing and everlasting love:

Jeremiah 31:3
Psalms 119:142
Daniel 9:24

God's everlasting righteousness:

Isaiah 45:17
Isaiah 54:8

God's everlasting salvation

Isaiah 60:19-20

God's everlasting kindness

the LORD as the everlasting light

Genesis 3:22-23

Immortality is conditionally offered to human beings

See also

Psalms 6:5; 88:5,10; 115:17
Daniel 12:2
Genesis 5:24

The most specific OT reference to immortality. Note that while resurrection to judgment is for all, immortality is only for the righteous (Pr 12:28).

2 Kings 2:11

Enoch and Elijah: two special cases

Psalms 16:9-11

The confidence of believers

See also

Psalms 17:15; 21:6; 73:24; 133:3
Isaiah 25:8

See also

God will abolish death

1035 God, faithfulness
1090 God, majesty of
1130 God, sovereignty
1145 God, transcendent
1165 God, unique
5065 spirit, fallen & redeemed
6206 offence
9020 death
9122 eternity & God
9210 judgment, God's