A doctrine now best known in its Pentecostal form. Pentecostals generally claim that the believer is empowered for Christian witness through a unique action of Christ (cf. Mk. 1: 8), distinct from conversion or sacramental Baptism (‘water baptism’). They maintain that, as the Holy Spirit fell on the first Apostles, so those summoned to be likewise ‘filled’ (cf. Acts 2: 4) are ‘baptized with the Holy Spirit’ (cf. Acts 11: 15 f.), and that the normal outward sign of this ‘baptism’ is their breaking into tongues (i.e. glossolalia) (cf. Acts 10: 44–7). This teaching has been accepted in a modified form by many members of the Charismatic Renewal Movement in the main Churches.