Sahih Bukhari

Narrated Al-Aswad:That `Aisha said, ""O Allah's Messenger (ﷺ)! The people are returning after performing the two Nusuks (i.e. Hajj and `Umra) but I am returning with one only?"" He said, ""Wait till you become clean from your menses and then go to at-Tan`im, assume Ihram (and after performing `Umra) join us at such-and-such a place. But it (i.e. the reward of `Umra) is according to your expenses or the hardship (which you will undergo while performing it).""