Salawat: The Beloved Worship on Friday

Hawzah News Agency- Imam Baqir(pbuh) said:

ما مِن شَی ءٍ یُعبَدُ اللّه ُ بِهِ یَومَ الجُمُعَهِ أحَبَّ إلَیَّ مِنَ الصَّلاهِ عَلی مُحَمَّدٍ و آلِ مُحَمَّدٍ

On Friday, no act of worship is dearer to me than sending blessings(salawat) upon Muhammad and his family.

Kafi, vol. 3, p. 439.