Yaala bin Umaya reported,
The Messenger of Allah ﷺ saw a man bathing in an open space without a wrapper, so he ascended the pulpit, praised Allah and extolled Him, then said, "Indeed, Allah 
is modest and concealing. He loves modesty and concealment. So when one of you bathes, let him cover himself."
Azami 1487
Hasanعن يعلى بن أمية
أن رسول الله ﷺ رأى رجلا يغتسل بالبراز بلا إزار، فصعد المنبر، فحمد الله وأثنى عليه، ثم قال: إن الله عز وجل حيي ستير يحب الحياء والستر؛ فإذا اغتسل أحدكم فليستتر.
Bazzar reported it in Musnad Bazzar (4012) and Nasai (406), both from Abdullah bin Muhammad bin Ali bin Nufayl, who said, Zuhayr narrated to us, from Abdul-Malik bin Abu Sulayman Urzumi, from Ata, from Yaala, and he mentioned the hadith. Ata here is Ibn Abu Rabah, who did not hear from Yaala bin Umaya.Then Abu Dawud (4013), Nasai (407), and Ahmad (17970) all reported it through the route of Abu Bakr bin Ayyash, from Abdul-Malik bin Abu Sulayman, from Ata, from Safwan bin Yaala bin Umaya, from his father, in similar wording. This chain is connected, except that Abu Bakr bin Ayyash's reliability is disputed. Ahmad and Ajli deemed him trustworthy. Abu Ahmad Hakim said, "He was not a hafiz." Bazzar said, "He was not a hafiz." Ibn Hajar said, "He was a trustworthy worshipper, but when he grew old his memory weakened, though his book is sahih, and his narration appears in the introduction of Sahih Muslim."Likewise, Abdul-Malik bin Abu Sulayman Urzumi is also disputed, though his hadith is hasan when he does not err.