‘Abdullāh ibn ‘Abbās (may Allah be pleased with him) reported: "The seven heavens and the seven earths in the palm of the Most Merciful are no more than a mustard seed in the hand of one of you." Al-Albaani reported from Ibn Taymiyyah that it is Sahih/Authentic, but he left no comment on it - Ibn Jareer - Adh-Dhahabi in Al-‘Uluww - ‘Abdullah ibn Ahmad ibn Hanbal