Genesis 50:3

Now forty days were required for this, for that is the customary number of days [of preparation] required for embalming. And the Egyptians wept and grieved for him [in public mourning as they would for royalty] for seventy days.

Numbers 20:29

When all the congregation saw that Aaron had died, all the house of Israel wept (mourned) for him thirty days.

Deuteronomy 34:8

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.

Genesis 50:10

When they came to the threshing floor of Atad, which is beyond the Jordan, they mourned there with a great lamentation (expressions of mourning for the deceased) and [extreme demonstrations of] sorrow [according to Egyptian custom]; and Joseph observed a seven-day mourning for his father.

Deuteronomy 21:13

She shall take off the clothes of her captivity and remain in your house, and weep (mourn) for her father and her mother a full month. After that you may go in to her and be her husband and she shall be your wife.

Treasury of Scripture Knowledge

Summary

And forty days were fulfilled for him; for so are fulfilled the days of those which are embalmed: and the Egyptians mourned for him threescore and ten days.

Bible References

Three-score

Numbers 20:29
When all the congregation saw that Aaron had died, all the house of Israel wept (mourned) for him thirty days.
Deuteronomy 21:13
She shall take off the clothes of her captivity and remain in your house, and weep (mourn) for her father and her mother a full month. After that you may go in to her and be her husband and she shall be your wife.
Deuteronomy 34:8
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.