# All Israel gathered together and mourned for him

A large number of the people of Israel were probably there, but some were probably unable to attend. 

# gathered together

"met together"

# buried him in his house at Ramah

in his home town of Ramah or on his family's land in Ramah or in his house in Ramah.

# David rose and went down

"David and his men moved on and they went down"