Nombres 20:29
And when all the congregation saw that Aaron was dead, they mourned for Aaron thirty days, even all the house of Israel.
Deutéronome 21:13
And she shall put the raiment of her captivity from off her, and shall remain in thine house, and bewail her father and her mother a full month: and after that thou shalt go in unto her, and be her husband, and she shall be thy wife.
Deutéronome 34:8
And the children of Israel wept for Moses in the plains of Moab thirty days: so the days of weeping and mourning for Moses were ended.