Prohibition of Squandering Wealth

Warrad, the scribe of Al-Mughirah bin Shu'bah (May Allah be pleased with him) said:
Al-Mughirah bin Shu'bah dictated a letter to me addressed to Mu'awiyah (May Allah be pleased with him) that the Prophet ﷺ used to supplicate at the end of each obligatory Salat (prescribed prayer): "La ilaha illallahu, wahadahu la sharika lahu, lahul-mulku, wa lahul-hamdu, wa Huwa 'ala kulli shai'in Qadir. Allahumma la mani'a lima a'taita, wa la mu'tiya lima mana'ta, wa la yanfa'u dhal-jaddi mink-al-jaddu. (There is no true god except Allah, the One, Who has no partner. His is the sovereignty and His is the praise, and He is Able to do everything. O Allah! Nobody can withhold what You give; and nobody can give what You withhold; and the high status of a person is of no avail against Your Will)." He also wrote to him that the Prophet ﷺ used to forbid irrelevant talk, wasteful expenditure, persistent questioning, disobedience of parents (especially mothers), infanticide of daughters by burying them alive, depriving others of their rights and acquisition of property wrongfully.

[Al-Bukhari and Muslim].

وعن وراد كاتب المغيرة شعبة قال: أملى على المغيرة بن شعبة في كتاب إلى معاوية رضي الله عنه ، أن النبي ﷺ أن يقول في دبر كل صلاة مكتوبة: "لا إله إلا الله وحده لا شريك له، له الملك وله الحمد وهو على كل شيء قدير، اللهم لا مانع لما أعطيت، ولا معطي لما منعت، ولا ينفع ذا الجد منك الجد" وكتب إليه أنه "كان ينهى عن قيل وقال، وإضاعة المال، وكثرة السؤال، وكان ينهى عن عقوق الأمهات، ووأد البنات، ومنع وهات” ((متفق عليه وسبق شرحه)).