Abdullah bin Shaqiq reported,

I asked Ayesha, "Did the Messenger of Allah ﷺ ever fast an entire month?"She replied, "I do not know of him fasting an entire month without breaking his fast on some of its days, except for Ramadan, nor did he leave off fasting for an entire month without fasting some of its days, until he passed on his way ﷺ."

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عن عبد الله بن شقيق قال

سألت عائشة أكان رسول الله ﷺ يصوم شهرا كله قالت ما علمته صام شهرا كله حتى يفطر منه إلا رمضان ولا أفطر شهرا كله حتى يصوم منه حتى مضى لوجهه أو لسبيله ﷺ