There are a lot of verses related to mourning. Here is a good source: https://bible.knowing-jesus.com/topics/Mourning#thematic_title_33675
Mourning can last many days. “When the entire community saw that Aharon was dead, they mourned Aharon thirty days, the whole house of Isra’el.” Numbers 2-:29
“The people of Isra’el mourned Moshe on the plains of Mo’av for thirty days; after this, the days of crying and mourning for Moshe ended.” Deuteronomy 34:8
“Yosef fell on his father’s face, wept over him and kissed him. Then Yosef ordered the physicians in his service to embalm his father (Jacob). So the physicians embalmed Isra’el. Forty days were spent at this, the normal amount of time for embalming. Then the Egyptians mourned for him seventy days.” Genesis 50:1-3
The biggest instance of mourning is still future:
“When that day comes, I will seek to destroy
all nations attacking Yerushalayim;
and I will pour out on the house of David
and on those living in Yerushalayim
a spirit of grace and prayer;
and they will look to me, whom they pierced.”
They will mourn for him
as one mourns for an only son;
they will be in bitterness on his behalf
like the bitterness for a firstborn son.
When that day comes, there will be
great mourning in Yerushalayim,
mourning like that for Hadad-Rimmon
in the Megiddo Valley.
Then the land will mourn,
each family by itself —
the family of the house of David by itself,
and their wives by themselves;
the family of the house of Natan by itself,
and their wives by themselves;
the family of the house of Levi by itself,
and their wives by themselves;
the family of the Shim‘i by itself,
and their wives by themselves;
all the remaining families, each by itself,
and their wives by themselves.” Zechariah 12:9-14
Notice how everyone mourns in isolation. This will probably occur on Yom Kippur.
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