Saad bin Abu Waqqas reported,

There were two brothers, and one of them died forty nights before the other. The merits of the first were mentioned in the presence of the Messenger of Allah ﷺ, and he asked, "Was the other one not a Muslim?"They replied, "Yes he was, Messenger of Allah, and there was nothing wrong with him."The Messenger of Allah said, "How do you know what his prayer attained for him? Prayer is like a deep, sweet river at the door of one of you, into which he plunges five times every day. How much of his grime do you think that would leave behind? You have no idea what his prayer attained for him."

Malik 432

Sahih

وحدثني عن مالك، أنه بلغه

عن عامر بن سعد بن أبي وقاص، عن أبيه أنه قال

كان رجلان أخوان، فهلك أحدهما قبل صاحبه بأربعين ليلة فذكرت فضيلة الأول عند رسول الله ﷺ فقال: ألم يكن الآخر مسلما؟ قالوا: بلى يا رسول الله وكان لا بأس به فقال رسول الله: وما يدريكم ما بلغت به صلاته إنما مثل الصلاة كمثل نهر غمر عذب بباب أحدكم، يقتحم فيه كل يوم خمس مرات، فما ترون ذلك يبقي من درنه؟ فإنكم لا تدرون ما بلغت به صلاته

مالك 432صحيح
Contents
Reference
Commentary
Ayat
Collection
Muwatta Malik
Book
Shortening prayer while traveling
Numbering
Laithi 432
Malik 432