مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3849
Musnad of Abdullah bin Mas'ood
It was narrated from Abdur-Rahman bin al-Aswad, from his father, that Ibn Mas'ood (رضي الله عنه) told him that The Messenger of Allah (ﷺ) usually departed, after the prayer, to the left, towards the apartments of his wives.
Musnad Ahmad 3872Saheeh; this is a hasan isnad]