It was narrated from Ibn ‘Umar that the Prophet (ﷺ) offered the funeral prayer for Najashi and said four Takbir.
Sunan Ibn Majah Book 6, Hadith 106
← Previous Hadith “Pray for a brother of yours who has died in a land other than yours.” They said: “Who is he?” He said: “Najashi.”

Sunan Ibn Majah Book 6, Hadith 105 Next Hadith → “Whoever offers the funeral prayer will have one Qirat and whoever awaits until (the burial) is finished will have two Qirat.” They said: ‘What are these two Qirat?’ He said: ‘Like two mountains.’”

Sunan Ibn Majah Book 6, Hadith 107