أَخْبَارِ ٱلْأَيَّامِ ٱلثَّانِي 7:9

وَعَمِلُوا فِي ٱلْيَوْمِ ٱلثَّامِنِ ٱعْتِكَافًا لِأَنَّهُمْ عَمِلُوا تَدْشِينَ ٱلْمَذْبَحِ سَبْعَةَ أَيَّامٍ، وَٱلْعِيدَ سَبْعَةَ أَيَّامٍ.

And in the eighth day they made a solemn assembly: for they kept the dedication of the altar seven days, and the feast seven days.