The Messenger of Allah ﷺ said, "When a servant prays well in public and prays well in private, Allah says, 'This is truly My servant.'"
حدثنا كثير بن عبيد الحمصي حدثنا بقية عن ورقاء بن عمر حدثنا عبد الله بن ذكوان أبو الزناد عن الأعرج
قال رسول الله ﷺ إن العبد إذا صلى في العلانية فأحسن وصلى في السر فأحسن قال الله عز وجل هذا عبدي حقا
No references are available.
[Its chain is daif] Busiri deemed it daif because of Baqiyyah's use of "an," as previously noted, no. 551, 1121. Abu Hatim said, "This hadith is munkar. It appears to be from the hadith of Ubadah bin Kathir." (Ilal 1/189, no. 541)