مختصر صحيح بخاري
Mukhtasar Sahih Bukhari
Book of Adhan (Call to Prayer)
If travelers are many, give adhan and iqamah
Narrated by Sayyiduna Ibn Umar (may Allah be pleased with them both): The Messenger of Allah (peace and blessings of Allah be upon him) used to instruct the mu’adhdhin, after the adhan, to say: "Pray in your places" (and do not come for the congregation), and this was done on cold or rainy nights (when) on a journey.
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