Psalm 15 was recognized early as a catechetical psalm of the Decalogue, and as a liturgical psalm, it was frequently repeated throughout the week by monks.
Here are some notes from Steven W. Lawson in his commentary on Psalms.
MAIN IDEA: David describes the moral integrity and personal holiness of the person who worships God.
TEACHING OUTLINE
A. The Searching Question (1)
1. WHO may approach God? (1a)
2. WHO may abide with God? (1b)
B. The Spiritual Qualifications (2-5b)
1. His character must be holy (2a-5)
2. His conversations must be holy (2c-3a)
3. His contacts must be holy (3b-c)
4. His company must be holy (4a-b)
5. His commitments must be holy (4c-d)
6. His commerce must be holy (5a-b)
C. The Strong Assurance (5c)
1. He will be intimate with God
2. He will be immovable in God
QUESTIONS for discussion:
Do you examine yourself before you come into the presence of God?
Are you living a blameless and righteous life?
In which one of these areas are you struggling in you Christian life?
What is our basis for righteousness?