Ayesha reported,
When the Prophet ﷺ returned from the Battle of the Trench, laid down his weapons, and bathed, Jibreel 
came to him and said, "You have laid down your weapons? By Allah, we have not laid ours down. Go out to them."The Prophet ﷺ asked, "Where to?"Jibreel replied, "Over here," and he pointed toward Qurayza.So the Prophet ﷺ went out to them.
Azami 513
Sahihعن عائشة قالت
لما رجع النبي ﷺ من الخندق، ووضع السلاح، واغتسل أتاه جبريل عليه السلام فقال: قد وضعت السلاح، والله ما وضعناه. فاخرج إليهم، قال: فإلى أين؟ قال: ها هنا، وأشار إلى قريظة، فخرج النبي ﷺ إليهم.
Bukhari narrated it in Maghazi (4117) and Muslim in Jihad (1769), both from the hadith of Ibn Numayr, from Hisham, from his father, from Ayesha, and the wording is Bukhari's. For more, see the Battle of Banu Qurayza in the book of Sirah and Maghazi.