Genesis 50:10 And they came to the threshing-floor of Atad, which is beyond the Jordan, and there they wailed with a very great and sore wailing; and he made a mourning for his father seven days. (See NIV)
1 Chronicles 9:25 And their brethren, in their villages, were to come in every seven days from time to time to be with them; (See NIV)