Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Abu Marwan that when Hazrat Ka'b would break his fast, he would face the Qiblah and supplicate three times as follows: O Allah! Grant me deliverance from every calamity that will descend from the sky at night. And when the edges of the sun would rise, he would supplicate three times as follows: O Allah! Appoint for me a share in every goodness that descends from the sky to the earth at night. The narrator says: Then he was asked about this supplication, so he replied: It is the supplication of Dawud; therefore, soften your tongues with this supplication, and make it a sign in your hearts.