ʿUmar, may Allah be pleased with him, heard and transmitted this saying of the Prophet ﷺ:
إِنَّمَا الأَعْمَالُ بِالنِّيَّاتِ (Sahih al-Bukhari: 1, opening excerpt)
Translation: Actions depend on intentions.
• Narrator: ʿUmar.
• The saying belongs to: the Prophet ﷺ, not to ʿUmar speaking for himself.
We do not call this mawqūf merely because ʿUmar transmits it. A Companion's name in a sanad is not enough; we need to know whose words or conduct are reported.