Volume 4, Book 52, Number 130:
Narrated ‘Aisha:
Whenever the Prophet intended to proceed on a journey, he used to draw lots amongst his wives
and would take the one upon whom the lot fell. Once, before setting out for Jihad, he drew lots
amongst us and the lot came to me; so I went with the Prophet; and that happened after the revela –
tion of the Verse Hijab (i.e. veiling).