Musannaf Ibn Abi Shayba 33:1484

Hushaym narrated to us, from Isma'il, from Habib ibn Abi Thabit, that some of the companions of the Prophet (may Allah bless him and grant him peace) said: "O Messenger of Allah, we perform deeds in secret, then we hear people talking about them, and it pleases us that we are mentioned with good." He said: "You have two rewards: the reward of the secret [deed] and the reward of the public [deed]."