Malik related to me from Abdullah ibn Dinar saying, "Abdullah ibn
Umar and I were at the house of Khalid ibn Uqba who was away at the
market. A man came who wanted to speak to Abdullah ibn Umar and I was
the only other person present Abdullah ibn Umar called another man so
that we were four and said to me and the man whom he had called, 'Go a
little way off together, because I heard the Messenger of Allah, may
Allah bless him and grant him peace, say, "Two do not converse
secretly to the exclusion of another.' "'