Pentecostal theology teaches the Baptism in the Holy Spirit (or Baptism with the Holy Spirit) is a definite experience, not identical with conversion (Acts 19:2). That is to say, it is both distinct from and subsequent to salvation (though it may occur immediately -Acts 10:44). While all believers are indwelt by the Holy Spirit, the Baptism with the Holy Spirit refers to the first time the believer is filled with the Holy Spirit (i.e.Acts 2:4). This does not mean however that that believer will be permanently filled with the Holy Spirit, but he is to seek to be filled when he is not (Eph. 5:18).