Silsilah as-Sahihah 4030 — Nature and intensity of revelation

Sayyiduna Sahl bin Sa’d (may Allah be pleased with him) narrates from Sayyiduna Zayd bin Thabit (may Allah be pleased with him), who says that when revelation would descend upon the Prophet (peace and blessings be upon him), he would fall into hardship, and sweat like pearls would flow from his forehead, even if it was the cold season.