New Defender's Study Bible Notes
30:3 the grave. The “grave” here is the Hebrew sheol, the abode of departed souls in the center of the earth. In the full sense, this verse must be a prophecy of the resurrection of Christ (see Psalm 16:10), with David’s deliverance from his enemies considered as a type thereof (Psalm 30:9).
30:5 in the morning. This psalm speaks of suffering followed by glory. That was the experience of Christ (I Peter 1:11), and is—in greater or lesser degree—the common experience of all His followers (Romans 8:18). Note also Psalm 30:11.