'Seventh' in the Bible

It happened in the seventh year, in the fifth [month], the tenth [day] of the month, that certain of the elders of Israel came to inquire of Yahweh, and sat before me.

It happened in the eleventh year, in the first [month], in the seventh [day] of the month, that the word of Yahweh came to me, saying,

So you shall do on the seventh [day] of the month for everyone who errs, and for him who is simple: so you shall make atonement for the house.

In the seventh [month], in the fifteenth day of the month, in the feast, shall he do the like the seven days; according to the sin offering, according to the burnt offering, and according to the meal offering, and according to the oil.