Skandapurana 5.100.4

5.100.4

tato rāmaścirātsmṛtvā tāṃ pratijñāṃ svayaṃ kṛtām ..
vadhārthaṃ saṃpraviṣṭasya samīpe puruṣasya ca .. 4 ..

Then Rāma, after a long silence, remembered that promise made by himself / for the execution of any person who entered into their presence.