«كان إذا لقيه أحد من أصحابه فقام معه قام معه فلم ينصرف حتى يكون الرجل هوالذي ينصرف عنه وإذا لقيه أحد من أصحابه فتنأول يده نأوله إياها فلم ينزع يده منه حتى يكون الرجل هوالذي ينزع يده منه وإذا لقي أحدا من أصحابه فتنأول أذنه نأوله إياها ثم لم ينزعها حتى يكون الرجل هوالذي ينزعها عنه»
It was the practice of the Prophet (peace and blessings be upon him):
"When one of his (peace and blessings be upon him) Companions met him (peace and blessings be upon him) and stood with him (peace and blessings be upon him), he (peace and blessings be upon him) would not turn away until that man himself left. And when one of his (peace and blessings be upon him) Companions met him (peace and blessings be upon him) and took hold of his (peace and blessings be upon him) hand, he (peace and blessings be upon him) would not withdraw his hand until that man himself withdrew his hand. And when he (peace and blessings be upon him) met one of his Companions and that Companion drew close to his (peace and blessings be upon him) ear and took hold of it, he (peace and blessings be upon him) would not pull it away until that man himself moved away."
Hadith Referenceصحیح الجامع الصغیر / حرف الكاف / 4780