Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Sa’d bin Abi Waqqas (may Allah be pleased with him) that the Noble Prophet (peace and blessings of Allah be upon him) said: “When you come for prayer, come with dignity and calmness. Whatever part of the prayer you catch (with the Imam), perform it, and whatever you miss, complete it afterwards.”