Abdullah bin Umar used to see his son Ubaydullah bin Abdullah performing voluntary prayers while traveling, and he did not object to it.
وحدثني عن مالك، قال: بلغني
أن عبد الله بن عمر كان يرى ابنه عبيد الله بن عبد الله يتنفل في السفر، فلا ينكر عليه
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