Isma'il bin 'Abdur Rahman al-Saddi إسماعيل بن عبد الرحمن السدي · Chapters on Supplication

The Prophet said: “There is nothing more honorable with Allah than supplication.”

the Prophet said: “The supplication is the essence of worship.”

The Prophet said: “The supplication, is worship.” Then he recited: And Your Lord said: “Call upon me, I will respond to you. Verily, those who scorn My worship, they will surely enter Hell humiliated."

When a matter would worry the Prophet (ﷺ), he would raise his head up toward the sky and say: “Glory is to Allah, the Magnificent (Subḥān Allāhil-`Aẓīm).” And when he would strive in supplication; he would say: “O the Living, O Sustainer (Yā Ḥayyu yā Qayyūm).”

“May the man before whom I am mentioned - and he does not send Salat upon me - be humiliated. And may a man upon whom Ramadan enters and then passes, before he is forgiven, be humiliated. And may a man whose parents reached old age in his presence, and they were not a cause for his entrance to Paradise, be humiliated.”