2 occurrences across the corpus

King James Version

2 Peter 3:9

The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.

KJV Apocrypha (Eastern Orthodox Additions)

2 Esdras 5:42

And he said unto me, I will liken my judgment unto a ring: like as there is no slackness of the last, even so there is no swiftness of the first.