Refreshing hearts so that they retain

It is narrated from Qasamah bin Zuhayr (may Allah have mercy on him) that he said: "Refresh and gladden your hearts (by giving them rest and ease), so that they may properly understand the remembrance and admonition and retain it."
[Takhrij: Ibn al-Mubarak narrated it in al-Zuhd (1105), and its chain is sahih (authentic).]

It is narrated from al-Hasan al-Basri (may Allah have mercy on him) that he said: "Polish these hearts of yours and keep them fresh (through admonition and the remembrance of Allah), for they very quickly become rusty, and the dust of heedlessness settles upon them."
[Ibn al-Mubarak recorded it in al-Zuhd: 147, and Hannad bin al-Sari in al-Zuhd: 588.]

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Qur'an was recited in the blessed gathering of the Prophet (peace and blessings be upon him) and some poetry was also recited (melodiously). So it was said (in surprise): "O Messenger of Allah (peace and blessings be upon him), can the Qur'an and poetry both come together in a single gathering?" He (peace and blessings be upon him) said: "Yes."
Imam Abu Ya'la recorded it in his Musnad. Its chain contains the narrator Muhammad bin al-Sa'ib al-Kalbi, who is matruk (abandoned); however, the Prophet's (peace and blessings be upon him) listening to poetry in a gathering is established by other authentic hadith.