Psalm 88:8 already states 'you have caused my companions to shun me' — nearly identical to 88:18's lament about friends becoming darkness.

Psalm 31:11 describes becoming a reproach to neighbors and acquaintances fleeing — same theme of abandonment as Psalm 88:18.

Psalm 38:11 says friends and kin stand far off — directly parallel to Psalm 88:18's 'beloved and friend shun me'.

In Psalm 142:4, David laments that no one cares for him, echoing the same sense of total abandonment by friends.

Job 19:12-15 details brothers far off, friends estranged, guests counting him as stranger — mirrors the social isolation in Psalm 88:18.

In Job 19:13, Job says God has alienated his family and acquaintances, directly paralleling the psalmist's loss of friend and neighbor.

In Luke 23:49, Jesus' acquaintances stand at a distance, a less severe abandonment but still echoing the psalmist's loss of close companions.

In Proverbs 19:7, the poor are shunned by relatives and friends, a general wisdom parallel to the psalmist's experience of being forsaken.