“Mendicants, someone with four qualities is cast down to hell. What four? Bad conduct by way of body, speech, and mind, and being ungrateful and thankless. Someone with these four qualities is cast down to hell.
Someone with four qualities is raised up to heaven. What four? Good conduct by way of body, speech, and mind, and being grateful and thankful. Someone with these four qualities is raised up to heaven.”
Read this translation of Aṅguttara Nikāya 4.213 Akataññutāsutta: Ungrateful by Bhikkhu Sujato on SuttaCentral.net.