Abdullah bin Masud reported,

We used to greet one another during the prayer and speak about our needs. I came to the Messenger of Allah ﷺ while he was praying and greeted him, but he did not return my greeting. I was overcome with worry about what had happened in the past and what had just occurred.When the Messenger of Allah ﷺ finished the prayer, he said, "Allah brings about whatever He wills in His affairs, and Allah, Mighty and Majestic, has now decreed that you are not to speak during the prayer."Then he returned my greeting.

Abu Dawud 924

Hasan

حدثنا موسى بن إسمعيل حدثنا أبان حدثنا عاصم عن أبي وائل

عن عبد الله قال

كنا نسلم في الصلاة ونأمر بحاجتنا فقدمت على رسول الله ﷺ وهو يصلي فسلمت عليه فلم يرد علي السلام فأخذني ما قدم وما حدث فلما قضى رسول الله ﷺ الصلاة قال إن الله يحدث من أمره ما يشاء وإن الله جل وعز قد أحدث من أمره أن لا تكلموا في الصلاة فرد علي السلام

أبو داود 924حسن
Contents
Reference
Commentary
Ayat
Collection
Sunan Abu Dawud
Book
Prayer
Chapter
Returning the greeting during prayer
Numbering
Darussalam 924
Abu Dawud 924