Jami` at-Tirmidhi Book 48, Hadith 227
“The Mufarridun have preceded.” They said: “And who are the Mufarridun, O Messenger of Allah (ﷺ)?” He said: “Those who absorb themselves in the remembrance of Allah, and remembrance removed their heavy burdens from them, until they will come on the Day of Judgement being light (in weight of their burdens).”
“The supplication is not rejected between the Adhan and the Iqamah.”
“That I should say: ‘Glory is to Allah (Subḥān Allāh).’ ‘All praise is due to Allah (Al-ḥamdulillāh),’ ‘None has the right to be worshipped by Allah (Lā ilāha illallāh),’ and ‘Allah is the greatest (Allāhu akbar)’ is more beloved to me than all that the sun has risen over.”