Musannaf Ibn Abi Shayba 33:38

Mu'awiyah ibn Hisham narrated to us, he said: Sufyan narrated to us, from Abu al-Mus'ab, from his father, from Ka'b, who said: When the fasting person would break his fast, he would face the Qibla and say: "O Allah, deliver me from every calamity that has descended from the heaven to the earth," three times. And when the edge of the sun would rise, he would say: "O Allah, grant me a share in every good deed that has descended from the heaven," three times. He said: It was said to him [about this], and he said: "It is the supplication of Dawud (David), so soften your tongues with it and let your hearts feel it."