Rashi on the Former Prophets
1 Kings 12
My little finger is thicker. My little finger.
Thorns. Aiguillon, in O.F., That sting like scorpions.
Look after your house. The Beis Hamikdosh that you built, will be for you alone.
Adoram. He was Adoniram.
And the tribe of Binyomin. Who were situated on the border, because the boundaries of Yehudah and Binyomin were adjacent.
If this people will go up, etc. Sitting in the Temple court is not permitted only for kings of the house of Dovid, therefore, he will be sitting and I will be standing. Moreover, [during Succos] following the Sabbatical Year, at the time of the Assembly, he [is the one who] will read the section [in Devarim] relating to the king, for he is the king of his province, whereas I will be [standing] like the rest of the people, and I will, therefore, be degraded.
Even as far as Dan. At the end of the boundary of the land.
Of the eighth month. He expounded to them that this was the month of the harvest, and was, therefore, the proper time for the festival to be.
He thought up out of his own heart. An expression of falsehood, controver, in O.F.
You arrive at the cited line; the whole work is yours to read around it. The text is set from the cited public-domain edition.