John 14:28 gives the reason: Jesus is returning to the Father. It explains why they should not be troubled as commanded in verse 1.

John 14:27 repeats 'Do not let your hearts be troubled' and adds Jesus' peace — directly building on the exhortation in verse 1.

In John 16:22, Jesus promises future joy that overcomes sorrow — the basis for the command not to be troubled.

In John 16:6, sorrow fills the disciples' hearts — the very trouble Jesus commands them to avoid here.

In John 13:19, Jesus foretells events so disciples may believe He is the I AM — the same belief John 14:1 calls for.

In John 12:44, Jesus says believing in Him is believing in the Father — explaining the dual belief in John 14:1.

In John 12:27, Jesus himself is troubled — contrasting with his command here for disciples not to be troubled.

In John 11:25-27, Jesus calls for belief in Him as the resurrection and life — directly reinforcing the command to believe in John 14:1.

In John 5:23, honoring the Son as the Father reinforces Jesus' command in John 14:1 to believe in him — both affirm his divine authority.

John 16:33 promises peace and says 'take heart' because Jesus overcame the world — a strong parallel within the same discourse, expanding the comfort.

1 John 5:10-12 declares eternal life for believers in the Son, underscoring the importance of belief.

1 John 2:23 links confessing the Son to having the Father, reinforcing belief in both.

1 Peter 1:21 explicitly ties faith in God through Christ, mirroring the dual belief in God and Jesus.

In 2 Thessalonians 2:2, Paul warns against being shaken or alarmed, echoing Jesus' command not to be troubled — both prescribe calm faith.

In 1 Thessalonians 3:3, Paul urges believers not to be shaken by afflictions, directly echoing Jesus' command to not let hearts be troubled.

In Psalm 42:5, the psalmist tells his soul to hope in God — directly parallel to Jesus' command to not be troubled but believe.

Lamentations 3:17-23 moves from bereft peace to remembering God's steadfast love — mirroring the hope Jesus offers to troubled hearts.

Psalm 43:5 repeats the refrain 'Hope in God' — a close parallel to Jesus urging belief in God as the antidote to a troubled heart.

Isaiah 43:2 promises God's presence through trials — reinforcing Jesus' call to trust rather than be troubled.

Isaiah 43:1 commands 'Fear not' with the assurance of redemption and belonging — the same comfort Jesus offers to troubled hearts.

In Isaiah 26:3, perfect peace comes to those who trust God — directly mirroring Jesus' promise of untroubled hearts through belief.

In Isaiah 12:2, trusting God leads to not being afraid — a direct OT parallel to Jesus' command to not be troubled and believe.

Psalm 77:2 describes a soul refusing comfort in trouble — the opposite response to Jesus' command not to be troubled.

Psalm 77:3 shows moaning and fainting when remembering God — contrasting with Jesus' call to believe and not be troubled.

In Matthew 14:27, Jesus says 'Take heart; it is I. Do not be afraid' — a direct parallel to His command here not to be troubled, both calming fear.

In 1 John 3:23, belief in Jesus Christ is commanded as God's commandment — the same call to believe Jesus gives here.

In 1 Peter 3:14, the same phrase 'be troubled' appears — Peter echoes Jesus' reassurance not to fear suffering.

Psalm 112:7 describes a heart firm in trust, not fearing bad news — directly analogous to not being troubled.

Mark 11:22 says 'Have faith in God' — nearly identical to Jesus' call here to believe in God, forming a strong parallel on trust.

Zechariah 13:7 prophesies the shepherd struck and sheep scattered — the very event that would trouble the disciples, which Jesus comforts them about here.

Psalm 42:8-11 echoes the same self-exhortation to hope in God despite distress, paralleling Jesus' call to not let hearts be troubled.

Jeremiah 8:18 laments a heart sick with grief — contrasting with Jesus' command to not be troubled by trusting in Him.

In Acts 3:16, faith in Jesus' name brings healing — showing the power of belief that John 14:1 commands.

Romans 15:13 prays for joy and peace in believing — thematically similar to John 14:1's call to believe and not be troubled, linking faith to peace.

In 2 Corinthians 4:8-10, Paul's description of being afflicted but not crushed echoes Jesus' call not to be troubled — both affirm faith sustains through distress.

In 2 Corinthians 12:9, God's grace being sufficient in weakness directly answers Jesus' command not to be troubled — it provides the strength to endure.

In Job 23:16, God troubles Job's heart — opposite of Jesus' reassurance that hearts need not be troubled.

Matthew 24:6 warns not to be alarmed by wars — similar to 'let not your hearts be troubled', though one concerns end times, the other Jesus' departure.

In Job 23:15, Job is troubled and afraid of God — whereas Jesus calls for faith in God that removes fear.

In Job 21:4-6, Job's spirit is troubled by his suffering — contrasting with Jesus' call for disciples not to let their hearts be troubled.

In 2 Corinthians 12:10, Paul's contentment in hardships exemplifies the untroubled heart Jesus commanded, finding strength in weakness.