Hadhrat Abdullah bin Umar (Radhiyallahu Anhuma) and His adherence to the Sunnah

عن مجاهد قال كنا مع ابن عمر رحمه الله في سفر فمر بمكان فحاد عنه فسئل لم فعلت ذلك قال رأيت رسول الله صلى الله عليه و سلم فعل هذا ففعلت رواه أحمد والبزار بإسناد جيد  (الترغيب والترهيب 1/100)

Hadhrat Mujaahid (Rahmatullahi Alaih) reports: “On one occasion we were with Hadhrat Abdullah bin Umar (Radhiyallahu Anhuma) on a journey. He passed by a certain place and suddenly moved off that path to another path. When asked why he had done that, he replied: ‘I had seen Rasulullah (Sallallahu Alaihi Wasallam) doing this, hence I did the same.’”