1)
Why is "la'Chevroni" repeated?
1.
Malbim: Initially, Chashavyah was appointed over Ever ha'Yarden Mizrachi. After they found others from Chevron's family from Bnei Yeriyah (24:23), and they were found in Yazir, in Ever ha'Yarden Mizrachi, the king appointed him over the Shevatim on the east side.
2)
Was only this in David's 40th year?
1.
'Rashi': No, all the counts [until here] were in his 40th year. Radak - at the start of them, it says "v'David Zaken v'Sava Yamim va'Yamlech Es Shlomo" (23:1). He counted the Leviyim and divided them into Mishmaros.
