What scripture says God is all knowing?

1 John 3:20 - For if our heart condemns us, God is greater than our heart, and knows all things.

1 Corinthians 2:10 - But God has revealed them to us through His Spirit. For the Spirit searches all things, yes, the deep things of God.

Psalm 44:21 - Would not God search this out? For He knows the secrets of the heart.

Also in the Quran, Allah is all knowing - in fact one of Allah's other beautiful names is Al Alim, meaning All Knowing.

In the Quran there are also several references.

The dwellers of the desert are very hard in unbelief and hypocrisy, and more disposed not to know the limits of what Allah has revealed to His Messenger; and Allah is Knowing, Wise (009.097)

A mercy from your Lord, surely He is the Hearing, the Knowing, (044.006)