This verse is part of a longer section in Numbers 7 that describes the offerings brought by the leaders of the twelve tribes of Israel at the dedication of the Tabernacle. Let's break down the verse:

"On the twelfth day...": This indicates that Ahira's offering was presented on the twelfth day of the twelve-day dedication ceremony. Each day, a different tribal leader brought an identical set of offerings.

"Ahira...": This is the name of the tribal leader.

"...the son of Enan...": This identifies Ahira's father, providing lineage.

"...prince of the children of Naphtali": This signifies Ahira's position as the leader or representative of the tribe of Naphtali. The "children of Naphtali" refers to the members of the tribe descended from Naphtali, one of the sons of Jacob (Israel).

In essence, the verse simply states that on the twelfth day of the Tabernacle dedication, Ahira, the son of Enan, who was the leader of the tribe of Naphtali, presented his offering.

Significance:

Order and Organization: This chapter highlights the meticulous organization and order within the Israelite camp. Each tribe had a designated leader who brought a specific offering on a specific day.
Equality Among Tribes: While each tribe had its day, the offerings were identical. This suggests a sense of equality and shared responsibility among the tribes.
Dedication and Worship: The offerings represented the tribes' dedication and commitment to God and the newly constructed Tabernacle. The leaders were acting on behalf of their tribes, showing their collective devotion.
Historical Record: The passage preserves the names of these tribal leaders, offering a glimpse into the leadership structure of the Israelite tribes during their wilderness journey.

The repetition of the offering descriptions for each tribe might seem tedious to modern readers, but it emphasizes the importance of each tribe's contribution and the thoroughness of the dedication process.