Bhagavad Gita 2.43
Consulting only their own desires, they construct their own heaven, devising arduous and complex rites to secure their own pleasure and power; and the only result is rebirth.
कामात्मानः स्वर्गपरा जन्मकर्मफलप्रदाम्।
क्रियाविशेषबहुलां भोगैश्वर्यगतिं प्रति॥kāmātmānaḥ svargaparā janmakarmaphalapradām|
kriyāviśeṣabahulāṃ bhogaiśvaryagatiṃ prati||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).