The Prophet ﷺ said, "Bilal, give us comfort through the prayer."
حدثنا وكيع حدثنا مسعر عن عمرو بن مرة عن سالم بن أبي الجعد
أن النبي ﷺ قال يا بلال أرحنا بالصلاة
No references are available.
Its isnad is sahih. It is found in Abu Dawud 4/297, no. 4986, in the Book of Manners, "The Isha Prayer." And in Bayhaqi 1/390, in the Book of Prayer.