Malik related to me from Abdullah ibn Dinar that Abdullah ibn Umar said, "When we took an oath of allegiance with him to hear and obey, the Messenger of Allah, may Allah bless him and grant him peace, said to us, 'In what you are able.' "
Muwatta Malik Book 55, Hadith 1
← Previous Hadith Malik related to me that he heard that Umar ibn al-Khattab saw a female slave belonging to Abdullah ibn Umar ibn al-Khattab. She was dressed like free (non-slave) women. He went to his daughter Hafsa and said, "Didn't I see your brother's slave-girl dressed like a free (non-slave) woman walking among the people and causing trouble?" Umar disapproved of that.

Muwatta Malik Book 54, Hadith 45 Next Hadith → Malik related to me from Muhammad ibn al-Munkadir that Umayma bint Ruqayqa said, "I went to the Messenger of Allah, may Allah bless him and grant him peace, with the women who took an oath of allegiance with him in Islam. They said, 'Messenger of Allah! We take a pledge with you not to associate anything with Allah, not to steal, not to commit adultery, not to kill our children, nor to produce any lie that we have devised between our hands and feet, and not to disobey you in what is known.' The Messenger of Allah, may Allah bless him and grant him peace, said, 'In what you can do and are able.' "

Umayma continued, "They said, 'Allah and His Messenger are more merciful to us than ourselves. Come, let us give our hands to you, Messenger of Allah!' The Messenger of Allah, may Allah bless him and grant him peace, said, 'I do not shake hands with women. My word to a hundred women is like my word to one woman.' "

Muwatta Malik Book 55, Hadith 2