I have this question. I have been wondering myself lately and it is that if the 12 imams have ever used a Wasilah through Tawassul before. I have already seen textual evidence for the validity of using a wasilah of the ones who have left this world (physical death) through Tawassul by ordinary people.
But my question is that if the 12 Imams have ever used a wasilah through Tawassul. What textual evidences and/or narrations talk about this topic?