Umar heard the saying about intentions. It was then heard from him and transmitted onwards.
Sanad (سند) is the sequence of people who transmitted a Hadith. It tells us who transmitted the report from whom.
• In this Hadith, Umar is one person in that sequence.
• His name alone is not the complete sanad.
• The sanad is distinct from the saying itself.
(Example reference: Sahih al-Bukhari: 1)