Can the Prophets and Imams communicate with Allah while in Barzakh, and if so, can they hear our Dua and make Dua on our behalf? If so, can you share some evidence for it?
The Prophet (SAWA) and the Infallible Imams (AS) who have been martyred are alive and never dead. Allah says in Quran ( Never say dead to those who were been killed in the way of Allah, in fact they are alive but you don’t feel. (Sura Al-Baqara, verse 154).
All Muslims greet the Prophet (SAWA) in every Prayer by saying: ASSALAMU Alayka Ayyuhan Nabiyyu Warahmatullah Wabarakatuh. Which means that the Prophet is alive that is why we greet him from where ever we are.
'The Prophet and Infallible Imams listen to us and pray for us.
'Wassalam.