مختصر صحيح بخاري
Mukhtasar Sahih Bukhari
Book of Jihad and Military Expeditions
Going to welcome returning fighters is Sunnah.
Sayyiduna Sa’ib bin Yazid (may Allah be pleased with him) says that we used to go with the boys up to Thaniyyatul Wada’ to welcome the Messenger of Allah (peace and blessings of Allah be upon him).