Richard Fishman, a third-year student at the University of Maryland Medical School and a strongly religious young man, decided to spend five weeks in Israel to study Orthodox Judaism.

He had taken a year's leave of absence from the medical school in Baltimore to study at the Ner Israel Rabbinical College also in Baltimore.

The trip was the final highlight of that year and he was to go back to his medical studies on July 5.

Mr. Fishman, who was 30, had been in Israel only a week and a half when he lost his life there on Friday. He was one of six persons aboard a city bus in Jerusalem who were killed when the bus was blown apart by a bomb.

"He felt strongly drawn to Israel," his father, Frederick Fishman, an administrative judge with the Department of Interior, said yesterday.

The family home is in Silver Spring. Richard Fishman, however, had been living in Baltimore for the last year and a half with the family of Rabbi Yehudah Mandelbaum, who is a teacher at the Yeshiva Institute of Baltimore.

While he planned on a medical career rather than a ribbinical one, Mr. Fishman felt that he needed the rabbinical background to help him in his commitment to help others, his father said. He hoped to apply his study of religion to medical ethics, the father added.

Mr. Fishman, who was born in Washington, was not reared as an Orthodox Jew but converted when he was about 22 or 23 years old, his father said.

He had graduated from the University of Pennsylvania in 1971 and then became associated with the production of health foods in Greenfield, Mass. for several years.

After he decided on a career in medicine, he returned to the University of Pennsylvania where he took several courses needed to enter medical school.

In addition to his father, he is survived by his mother, Evelyn C. Fishman, of the Silver Spring home. She is a service representative with the Social Security Administration.

Also surviving are a brother, Lawrence William Fishman, of Santa Rosa, Calif., and a sister, Ruth Ellen Fishman, of Washington.

Funeral arrangements are incomplete pending return of the body here from Israel.