When was laughter was mentioned in the Bible?

Answer 1

The first is when God told Abraham that his wife Sarah would have a child at 90 years old. (Genesis 14.7) Sarah also laughed at the news. (Genesis 18.12)

God also laughs at the wicked:

Psalms 37:13 The Lord shall laugh at him: for he seeth that his day is coming.

Psalms 59:8 But thou, O LORD, shalt laugh at them; thou shalt have all the heathen in derision.

There is a time to laugh as for every other purpose in life.

Ecclesiastes 3:4 A time to weep, and a time to laugh; a time to mourn, and a time to dance;