'Mourning' in the Bible

I have not eaten from the tithe while mourning, nor have I removed any of it when I was [ceremonially] unclean [making the tithe ceremonially unclean], nor offered any of it to the dead. I have listened to the voice of the Lord my God; I have done everything in accordance with all that You have commanded me.

So the sons of Israel wept for Moses in the plains of Moab for thirty days; then the days of weeping and mourning for Moses were ended.