Musnad Ahmad 8:29

Ali ibn Ishaq narrated to us, Abdullah informed us, Ibn Lahi'ah informed us, from Yazid ibn Abi Habib, from Dawud ibn Amir ibn Sa'd ibn Abi Waqqas, from his father, from his grandfather, from the Prophet, peace and blessings of Allah be upon him, who said: "If what could be carried by a fingernail of what is in Paradise were to appear, it would have adorned what is between the horizons of the heavens and the earth. And if a man from the people of Paradise were to look out and his bracelets were to appear, his light would have extinguished the light of the sun, just as the sun extinguishes the light of the stars."