Let Us.

"Let us draw near to God with a sincere heart in full assurance of faith, having our hearts sprinkled to cleanse us from a guilty conscience and having our bodies washed with pure water. Let us hold unswervingly to the hope we profess, for he who promised is faithful. And let us consider how we may spur one another on toward love and good deeds. Let us not give up meeting together, as some are in the habit of doing, but let us encourage one another—and all the more as you see the Day approaching." Hebrews 10:22 - 25
In this passage the words "Let us" occur 5 times. The first two exhort us in our relationship with God while the last three exhort us in our relationship with each other. Growing out of our relationship with God we have responsibility to other believers.