Genesis 50:2-3

2 Joseph commanded the physicians in his service to embalm his father. So the physicians embalmed Israel;
3 they spent forty days in doing this, for that is the time required for embalming. And the Egyptians wept for him seventy days.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.