Mishkat al-Masabih #605
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن مَالك بَلَغَهُ أَنَّ الْمُؤَذِّنَ جَاءَ عُمَرَ يُؤْذِنُهُ لِصَلَاةِ الصُّبْحِ فَوَجَدَهُ نَائِمًا فَقَالَ: الصَّلَاةُ خَيْرٌ مِنَ النَّوْمِ فَأَمَرَهُ عُمَرُ أَنْ يَجْعَلَهَا فِي نِدَاءِ الصُّبْح. رَوَاهُ فِي الْمُوَطَّأ
Malik heard that the mu'adhdhin came to ‘Umar to call him to the Morning Prayer. Finding him asleep, he said, “Prayer is better than sleep," and ‘Umar commanded him to include it in the call to Morning Prayer.
He transmitted it in al-Muwatta’.
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About Mishkat al-Masabih
This hadith is #605 from Mishkat al-Masabih, in the Book of Prayer.