Baptists have some varying positions on the use of the Old Testament scriptures, their relation to us today, salvation under the Old Testament, etc. Though the use of the word "scriptures" by the apostles & prophets may be sometimes in a general sense that the encompasses the N. T. canon, when there is a specific historical reference in the N. T. era to the use of the "scriptures," that reference is evidently to the Old Testament. Here are a few thoughts I have. The gospel that Paul preached was according to the Old Testament scriptures - I Corinthians 15:1-4. Philip preached Jesus to the eunuch using the Old Testament scriptures in Isaiah - Acts 8:35. Paul demonstrated from the Old Testament scriptures that Jesus was the Christ - Acts 17:1-4. Many Bereans believed as a result of searching the Old Testament scriptures - Acts 17:10-12. Apollos convinced Jews in Achaia that Jesus was the Christ using the Old Testament scriptures - Acts 18:28. The Old Testament scriptures testify of Christ - John 5:29. The Old Testament scriptures are able to make one wise unto salvation - II Timothy 3:15. The Old Testament scriptures teach salvation by grace through faith - Romans 4:3; 10:8-11; Galatians 3:8,22; I Peter 2:6.