Hadith: If the son of Adam were to own a valley of gold, he would desire to have two valleys. Nothing can fill his mouth except dust, and Allah accepts the repentance of whoever repents

عن عبد الله بن عباس وأنس بن مالك وعبد الله بن الزبير وأبي موسى الأشعري رضي الله عنهم أن رسول الله صلى الله عليه وسلم قال: «لو أن لابنِ آدمَ واديًا من ذَهَبٍ أَحَبَّ أن يكونَ له واديانِ، ولَنْ يملأَ فَاهُ إلا الترابُ، ويَتُوبُ اللهُ عَلَى مَنْ تَابَ».
[صحيح] - [حديث عبد الله بن عباس -رضي الله عنهما-: متفق عليه. حديث أنس بن مالك -رضي الله عنه-: متفق عليه. حديث عبد الله بن الزبير -رضي الله عنهما-: رواه البخاري. حديث أبي موسى الأشعري -رضي الله عنه-: رواه مسلم]

‘Abdullāh ibn ‘Abbās, Anas ibn Mālik, ‘Abdullāh ibn Az-Zubayr, and Abu Mūsa al-Ash‘ari (may Allah be pleased with them) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said: "If the son of Adam were to own a valley of gold, he would desire to have two valleys. Nothing can fill his mouth except dust, and Allah accepts the repentance of whoever repents."
Sahih/Authentic. - [Al-Bukhari]

Explanation

The Prophet (may Allah's peace and blessings be upon him) informed us that if the son of Adam had a valley filled with gold, then he would love to have two valleys of gold out of his greed, which is part of his nature. He will continue to be greedy for worldly possessions until he dies and his mouth and belly are filled with the dirt of his grave.