Hudhaifa reported God’s messenger as saying, “It is not fitting for a believer to demean himself." On being asked how he could demean himself he replied, “By exposing himself to a calamity which he has not the capacity to endure."
Tirmidhi, Ibn Majah and Baihaqi, in Shu'ab al-iman, transmitted it, Tirmidhi saying this is a hasan gharib tradition.
Narrated Anas told of God’s messenger visiting a Muslim who had become as weak as a chicken and asking him whether he had been accustomed to make any supplication to God or ask Him for anything. On his replying that he had, for he was accustomed to say, "O God, what Thou meanest to punish me with in the next:
The man used it in supplication to God, and God healed him.
‘Umar told that God’s messenger taught him to say, “O God, make my inner nature better than my outer, and make my outer nature good. O God, I ask Thee to give me some of the abundance Thou givest to men, in family, property and children, which neither strays nor leads astray."
Umm Ma'bad said she heard God’s messenger say, “O God, purify my heart from hypocrisy, my action from vain show, my tongue from falsehood and my eyes from wrongful glances, for Thou knowest the surreptitious looks of the eyes and what is concealed in the breasts.” 2
Baihaqi transmitted the two traditions in ad-Da'awat al-kabir.