Shama-il Tirmidhi Chapter 008, Hadith Number 005 (057).

Qurrah bin Ilyaas Radiyallahu'Anhu relates: "I came with a group from the tribe of Muzeenah to make bay'ah (pay allegiance) to Rasulullah Sallallahu 'Alayhi Wasallam. The button loop of Rasulullah Sallallahu 'Alayhi Wasallam's qamis was open. I put my hand in the collar of Rasulullah Sallallahu 'Alayhi Wasallam's qamis to touch the Seal of Prophethood (to gain barakah)".

Commentary.
When he visited Sayyidina Rasulullah Sallallahu 'Alayhi Wasallam he found the collar of Sayyidina Rasulullah Sallallahu 'Alayhi Wasallam's qamis open. It is characteristic of one who loves, that every act of his beloved sinks into his heart. Sayyidina 'Urwah Radiyallahu'Anhu, who is a narrator of this says: "I have never seen Mu'aawiyah (bin Qurrah - Radiyallahu'Anhu) and his son button up their collars. Be it summer or winter, their collars were always open". Their love for Sayyidina Rasulullah Sallallahu 'Alayhi Wasallam has given us a glimpse of each and every act and deed of the beloved Rasul of Allah, Sallallahu 'Alayhi Wasallam. 'Jazahumullahu 'anna wa-'an saa-iril ummati ahsanal jazaa'.