Baptist minister Donald Ossewaarde (above, with his wife Ruth) was working in the city of Oryol, southwest of Moscow, when he was visited by police.
They accused him of "unlawfully conducting missionary activity" by having Bible meetings at his home.
Earlier in the month he became the first American person to be fined under the Yarovaya, or anti-terror laws, which restrict organisations' and individuals' freedom to practice and share their faith.
International Christian Concern (ICC) says that the US Embassy has been present during the case.
During the last hearing the judge heard from both a police official and the pastor and decided that the case should be postponed until Friday to gather witnesses to the alleged illegal missionary activity.
He was fined £477 (40,000 roubles) for conducting "rituals and ceremonies" associated with religious activities without proper permission.
Speaking to ICC in September Donald Ossewaard said: "We believe we have the law on our side and a strong case moving forward."
Earlier in September embassy officials visited the Christian leader to find out more about ministry as well as reasons for his charge.
Andrew Kerr, ICC's Program Coordinator, said: "While it is unfortunate the judge in the case determined more time was needed to decide upon a decision, it is encouraging to hear of the attention and progress of the case itself.
"We hope further attention will be given to Pastor Donald's case both in Russia and the international community to show the unfortunate missteps of the Yarovaya laws and where reform is in desperate need to ensure religious freedom for all."
