The Messenger of Allah ﷺ said, "The lowest in rank among the people of Paradise, though none of them is truly low, is the one who keeps wishing. He says with a fluent, eloquent tongue and a sound mind, 'Give me this, give me that.' When he can no longer think of anything to ask for, he is prompted and told, 'Say this, say that.' Then he is told, 'It is yours, and the like of it along with it.'"
قال رسول الله ﷺ: إن أدنى أهل الجنة منزلة- وليس فيها دني- الذي يتمنى، فيقول بلسان طلق ذلق وعقل مجتمع: أعطني أعطني كذا، حتى إذا لم يجد شيئا لقن، فقيل له: قل كذا، قل كذا، فيقال له: هو لك ومثله معه.
No references are available.
Tabarani narrated it in al-Kabir (6/208), and Abu Naeem in Sifat al-Jannah (445), both of them through various routes from Abdul-Aziz bin Abu Hazim, who said, "My father narrated to me, from Sahl bin Saad," and he related it. Its chain of transmission is sahih.