Limited Atonement is one of the tenants of Calvinism. Limited Atonement means Christ's sacrifice on the cross only paid for the sins of the elect.

Verses that may be for:

Matthew 7:14 NASB -

"For the gate is small and the way is narrow that leads to life, and there are few who find it.

Matthew 26:28 NASB -

for this is My blood of the covenant, which is poured out for many for forgiveness of sins.

Verses against:

John 3:17

"For God did not send the Son into the world to judge the world, but that the world might be saved through Him.

Rom 5:6

For while we were still helpless, at the right time Christ died for the ungodly.

2 Cor 5:19

namely, that God was in Christ reconciling the world to Himself, not counting their trespasses against them, and He has committed to us the word of reconciliation.

1 Tim 2:5-6

For there is one God, and one mediator also between God and men, the man Christ Jesus, who gave Himself as a ransom for all, the testimony given at the proper time.

Hbr 2:9

But we do see Him who was made for a little while lower than the angels, namely, Jesus, because of the suffering of death crowned with glory and honor, so that by the grace of God He might taste death for everyone.

Peter 2:1

But false prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction upon themselves.

1 John 4:14

We have seen and testify that the Father has sent the Son to be the Savior of the world.

1 John 2:2

and He Himself is the propitiation for our sins; and not for ours only, but also for those of the whole world.

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Resources
At the Synod of Dort, both sides agreed that the atonement of Christ's death was sufficient to pay for all sin and that it was only efficacious for some (it only actually saved some). The controversy centered on whether this limited efficacy was based on God's election (the view of the Synod and of later Reformed theologians) or on the choice of each person and God's foreknowledge of that choice (the view of Arminius).
From Muller, Richard A. (2012). Calvin and the Reformed Tradition (Ebook ed.). Grand Rapids, MI: Baker Academic. pp. 51–52. ISBN 978-1-4412-4254-9.