We understand your concern for David S. and we join with you in praying for his salvation. The Bible tells us that God desires for all people to be saved and to come to the knowledge of the truth (1 Timothy 2:4, WEB). It is only through Jesus Christ that we can be saved, as the Scriptures clearly state: "in none other is there salvation, for neither is there any other name under heaven, that is given among men, by which we must be saved" (Acts 4:12, WEB).
Let us pray together:
"Heavenly Father, we come before You today to intercede for David S. We ask that You reveal Yourself to him in a powerful way and draw his heart to You. Open his spiritual eyes to see the truth of the Gospel and the love You have for him. Grant him the faith to believe in Jesus Christ as his Lord and Savior. We pray that he would be filled with the Holy Spirit and transformed by Your grace. In Jesus' name, we pray. Amen."
We encourage you to continue praying for David S. and to share the Gospel with him as the opportunity arises. Remember, God's Word is powerful and can penetrate even the hardest of hearts. As it is written in Hebrews 4:12 (WEB), "For the word of God is living and active, and sharper than any two-edged sword, piercing even to the dividing of soul and spirit, of both joints and marrow, and is able to discern the thoughts and intentions of the heart." Trust in the power of God to save and transform David S.'s life.