Al-Adab Al-Mufrad #638
Supplication
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَقَالَ النَّبِيُّ صلى الله عليه وسلم: مَنْ هَلَّلَ مِئَةً، وَسَبَّحَ مِئَةً، وَكَبَّرَ مِئَةً، خَيْرٌ لَهُ مِنْ عَشْرِ رِقَابٍ يُعْتِقُهَا، وَسَبْعِ بَدَنَاتٍ يَنْحَرُهَا.
The Prophet, may Allah bless him and grant him peace, said, "If
someone says, 'There is no god but Allah' one hundred times, 'Glory be
to Allah' one hundred times' and 'Allah is greater' one hundred times,
that is better than freeing ten slaves and slaughtering seven camels."
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About Al-Adab Al-Mufrad
This hadith is #638 from Al-Adab Al-Mufrad, in the Book of Supplication.