Hadith 1205:2
Al-Khuza'i narrated to us, Abdullah ibn Umar al-Umari informed us, from al-Qasim ibn Ghannam, from his paternal grandmother, from Umm Farwah, who had pledged allegiance to the Messenger of Allah, she said: The Messenger of Allah, peace and blessings of Allah be upon him, was asked about the best of deeds. He said: "Prayer at the beginning of its time."
حدثنا الخزاعي، أخبرنا عبد الله بن عمر العمري، عن القاسم بن غنام، عن جدته الدنيا، عن أم فروة وكانت قد بايعت رسول الله قالت: سئل رسول الله صلى الله عليه وسلم: عن أفضل الأعمال ؟ فقال: " الصلاة لأول وقتها "