Psalm 15 - Lord who shall sojourn in Your tabernacle?
Longing for the practical living out of the righteousness of Christ, because it qualifies us to dwell in God's house in this age and in eternity in the mountain of His holiness, which is the New Jerusalem.
None of the qualifying righteousnesses listed here are religious or spiritual things: not Old Testament things like keeping the Sabbath, nor even things like meditating on the Lord's word, or spending time in His presence.
Keeping the religious and spiritual things in the Bible should result in the living in this psalm. The simple righteousnesses in this Psalm seem common. They are things a person who has never read the Bible knows already. But living them out is not common. The test of true religion is such a life that manifests itself to every man's conscience.
v4 The humble person looks upon every child of God, the most weak and unworthy, and honors him and prefers him as a son of the King. - Andrew Murray
ref. Prov 17:15 He that justifieth the wicked, and he that condemns the righteous, even they both are abomination to Jehovah.
The 2 questions in the beginning of the Psalm are only partially answered here in this Psalm. As in our prayers, a further answer will come in the Psalms to follow.
Psalm 15 A Psalm through David
1 Who will sojourn, O LORD,
in Your tabernacle?
In the mount of Your holiness,
who shall forever dwell?
2 He that walks perfectly,
and working righteousness,
and speaking the truth in his heart,
shall dwell in blessedness.
3 He slanders not with tongue,
wrongs not his own neighbor,
and he lifts not up a reproach
against those who are near.
4 In his eyes a worthless
person is not esteemed,
but those who fear the LORD he'll bless,
and honor gen'rously.
He swears to his own hurt,
and still he does not change.
5 He gives not out his own money
for interest in exchange.
Against the innocent,
a reward he'll not take.
Now he who really does these things,
the world will never shake.