The Messenger of Allah ﷺ said, "Whoever remains seated in his place of prayer after finishing the dawn prayer until he performs the two rakahs of the forenoon prayer, speaking nothing but good, his sins will be forgiven even if they are more than the foam of the sea."
حدثنا محمد بن سلمة المرادي حدثنا ابن وهب عن يحيى بن أيوب عن زبان بن فائد
أن رسول الله ﷺ قال من قعد في مصلاه حين ينصرف من صلاة الصبح حتى يسبح ركعتي الضحى لا يقول إلا خيرا غفر له خطاياه وإن كانت أكثر من زبد البحر
[Its chain of transmission is daif] Ahmad reported it (3/438) through Zabban bin Fayd, and he is daif. The majority of scholars judged him daif, and the hadith has weak supporting narrations.