References – SN 22.87: Vakkali 
“You mentioned the example of the monk who wanted to commit suicide and then he remembered his virtue and that uplifted him. In the Saṃyutta Nikaya there are a few instances where monks committeed suicide, but the Buddha said they attained Nibbāna (SN 22.87 Vakkali; SN 35.87 Channa). How is that possible?” Answered by Ajahn Ñāṇiko. [Monastic life] [Suicide] [Sutta] [Buddha/Biography] [Recollection] [Nibbāna] // [Jhāna] [Māra] [Saṃsāra] [Delusion]
Developing Skill in Reflective Meditation [2019], Session 2, Excerpt 3