Mishkat al-Masabih #1918
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عَامِرِ بْنِ رَبِيعَةَ قَالَ: رَأَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَا لَا أُحْصِي يَتَسَوَّكُ وَهُوَ صَائِمٌ ". رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ
‘Amir b. Rabi'a said he had seen the Prophet more often than he could count using a toothstick while he was fasting.
Tirmidhi and Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #1918 from Mishkat al-Masabih, in the Book of Fasting.