When God decided to flood the world in the days of Noah. The rains began to fall
during the 3rd 7-day period of the second month and the 3rd day of this period.
Genesis 7:11-12
“11 In the six hundredth year of Noah's life, in the second month, the
seventeenth day of the month, the same day were all the fountains of the great
deep broken up, and the windows of heaven were opened.
12 And the rain was upon the earth forty days and forty nights.”
The rains began to fall on the 17th day of the 3rd-7 day period. The 17th is the
third day of the 3rd-7 day period.
The Bible contains many great events in which Yahweh has highlighted the 3rd-7
day period of a month.