John 5:44 explains why they lack love: seeking honor from men instead of God — the immediate cause Jesus identifies.

In John 5:38, Jesus says they lack God's word; here they lack love — both accusations of missing essential elements of faith in the same discourse.

In John 1:47-49, Jesus sees Nathanael's true character — no guile — demonstrating the same divine knowledge of hearts shown here.

John 2:25 explicitly states Jesus knew what was in people — directly reinforcing his knowledge that they lacked love of God.

In John 8:42, Jesus says if God were their Father they would love him — their lack of love stems from not being from God.

John 8:42 again ties love for Jesus to relationship with God — reinforcing that their lack of love reveals spiritual estrangement.

In John 8:55, Jesus again contrasts his knowledge of God with their ignorance, paralleling the lack of love for God in John 5:42.

In John 15:23, hating Christ means hating the Father, which echoes the charge that they lack love for God in John 5:42.

In John 15:24, Jesus states they have hated both him and the Father, reinforcing the absence of love for God seen in John 5:42.

In John 21:17, Peter acknowledges Jesus knows all things, including love — here Jesus knows they do not love God.

In John 2:24, Jesus knows what is in man; here he knows they lack love of God — both demonstrate his divine knowledge of hearts.

In John 6:64, Jesus knows who does not believe; here he knows they lack love — both show his awareness of unbelief and spiritual deficiency.

Revelation 2:23 states Jesus searches hearts and minds — the same omniscience that reveals their absent love for God.

In 1 John 4:20, loving God is proven false if one hates a brother, which explains the underlying condition in John 5:42.

In 1 John 3:17, lack of compassion for a brother questions whether God's love dwells in them, mirroring the charge in John 5:42.

In 1 John 2:15, love for the world precludes love for the Father, directly correlating with the absence of God's love in John 5:42.

Hebrews 4:13 declares nothing hidden from God's sight — Jesus here sees into their souls to know they lack love.

In Romans 8:7, the carnal mind is enmity against God, aligning with the lack of love for God exposed in John 5:42.

In Luke 11:42, Jesus condemns Pharisees for neglecting the love of God, which is exactly the accusation in John 5:42.

In Mark 7:6, Jesus quotes Isaiah about honoring God with lips but hearts far away, directly paralleling the lack of genuine love in John 5:42.

Luke 16:15 says God knows hearts and abhors self-justification — parallel to Jesus knowing their lack of true love for God.