It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that once we were sitting with the Prophet (peace and blessings be upon him) when a man said «الله اكبركبيرا والحمدلله كثيرا وسبحان الله بكرة واصيلا». The Prophet (peace and blessings be upon him) asked, "Who said these words?" The man replied, "O Messenger of Allah! I said them." The Prophet (peace and blessings be upon him) said: "By Him in Whose hand is my soul, I saw these words ascending, until all the gates of the heavens were opened for them." Sayyiduna Ibn Umar (may Allah be pleased with them both) says that since I heard this from the Prophet (peace and blessings be upon him), I have never abandoned these words, and Awn (may Allah have mercy on him) says that since I heard these words from Sayyiduna Ibn Umar (may Allah be pleased with them both), I have never abandoned them.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5722
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد ضعيف لضعف ابن لهيعة.