Genesis 50:3 in the World English Bible
Forty days were used for him, for that is how many days it takes to embalm. The Egyptians wept for Israel for seventy days.
Context
2 And Joseph commanded his servants the physicians to embalm his father: and the physicians embalmed Israel.
3 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.
4 And when the days of his mourning were past, Joseph spake unto the house of Pharaoh, saying, If now I have found grace in your eyes, speak, I pray you, in the ears of Pharaoh, saying,