It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "I have been permitted (by Allah Almighty) to speak about an angel whose two feet have pierced through the seventh earth and on whose shoulder is the Divine Throne. He (the angel, constantly declaring the glory and holiness of Allah) says: 'Subhanaka ayna kunta wa ayna takun' (Glory be to You! Where were You (in Your majesty and grandeur) before, and where will You be (that is, Your greatness and loftiness are beyond every limit and every confinement of place))."
It is sahih (authentic).
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب بدء الخلق / 3436
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :قال ابن حجر: صَحِيحٌ . » «أخرجه مسند أبي يعلى برقم: 6619»