Verses with the word holiest in the New Testament (3 verses):

Hebrews 9:3
And after the second veil, the tabernacle which is called the Holiest of all;

Hebrews 9:8
The Holy Ghost this signifying, that the way into the holiest of all was not yet made manifest, while as the first tabernacle was yet standing:

Hebrews 10:19
Having therefore, brethren, boldness to enter into the holiest by the blood of Jesus,