Can God lie?

No.

God cannot lie. God cannot deceive. He doesn’t lie because it goes against who He is.
God does not lie.
God is true and truth.

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Numbers 23:19 — "God is not a man, that He should lie, Nor a son of man, that He should repent; Has He said, and will He not do it? Or has He spoken, and will He not make it good?

1 Samuel 15:29 — ~"Also the Glory of Israel will not lie or change His mind; for He is not a man that He should change His mind."

Titus 1:2 — in the hope of eternal life, which God, who cannot lie, promised long ages ago,

Hebrews 6:18-19 — so that by two unchangeable things in which it is impossible for God to lie, we who have taken refuge would have strong encouragement to take hold of the hope set before us.
This hope we have as an anchor of the soul, a {hope} both sure and steadfast and one which enters within the veil,

2 Timothy 2:13 — If we are faithless, He remains faithful, for He cannot deny Himself.

Psalm 31:5 — Into Your hand I commit my spirit; You have ransomed me, O LORD, God of truth.

John 14:6 — Jesus *said to him, "I am the way, and the truth, and the life; no one comes to the Father but through Me.

John 17:3 — ~"This is eternal life, that they may know You, the only true God, and Jesus Christ whom You have sent.

Titus 1:1-2 — Paul, a bond-servant of God and an apostle of Jesus Christ, for the faith of those chosen of God and the knowledge of the truth which is according to godliness,
in the hope of eternal life, which God, who cannot lie, promised long ages ago,