To mourn or not to mourn?

Question from Lianne:
Can you tell me anywhere in scripture that it says we are not suppose to mourn? I would really appreciate your help with this.

Answer from Pastor Bob:
Nehemiah 8:9 says that the day was a holy day of celebration, and thus the people were told, "Do not mourn" on that day. The people wept because they were grieved over their sin when they heard the words of the law.