Numbers 20:29 in the King James Version
And when all the congregation saw that Aaron was dead, they mourned for Aaron thirty days, even all the house of Israel.
Context
28 Moses stripped Aaron of his garments, and put them on Eleazar his son. Aaron died there on the top of the mountain, and Moses and Eleazar came down from the mountain.
29 When all the congregation saw that Aaron was dead, they wept for Aaron thirty days, even all the house of Israel.