We have (echomen | ἔχομεν | pres act ind 1 pl) an altar from which those who serve in the tabernacle do (echousin | ἔχουσιν | pres act ind 3 pl) not have (echousin | ἔχουσιν | pres act ind 3 pl) the right to eat.
Reference
Hebrews 13:10
Sequence
487