Metro bus and subway schedules will be altered today and tomorrow because of an influx of several thousand persons expected to take part in the "Washington for Jesus" prayer services and events at RFK Stadium and on the Mall.

Subway prices will be operated as usual all day today, but Metro officials advise regular commuters to purchase fare cards in the morning to lessen congestion at the machines later, as people head for RFK Stadium to attend at 6 p.m. religious rally.

Rush hour train schedules will be extended as needed.

Tomorrow, between 3 a.m. and 5 a.m., Metro will operate a special shuttle train between the RFK Stadium-Armory station and the Smithsonian station to transport riders to a sunrise service on the mall. No fares will be charged because rally organizers have already paid for the service.

Metro officials said riders are encouraged to avoid if possible the use of the Metro Center station and those in the Mall area such as Smithsonian, Federal Triangle, L'Enfant Plaza and Union Station.

Passengers are encouraged to make their entire trips on the Red or Blue Lines, and walk from stations to their downtown destinations rather than transferring tomorrow.

Metrobuses normally serving the Mall area will be rerouted tomorrow to reduce congestion resulting from an all day prayer service scheduled to be held there. Rerouting is planned to begin at 11:30 a.m. about half an hour before thousands of people are expected to assemble in the Mall area near 7th Street and proceed west on Constitution Avenue.

Bus routes affected include Nos. 32, 34, 36, 52, 60, 70 and the M 8.

Many bus routes between Washington and Alexandria which originate or teminate near the Mall will also be affected, as will the Inbound No. 16 bus. The Outbound No. 16 will use its regular route.