Prayer: Acting on a Stronger Supposition for Qibla
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 770
If someone who has a supposition about the direction of qibla arrives at a stronger supposition, he cannot act on his first supposition. For example, if a guest has a supposition about the direction of qibla through the words of his host but he arrives at a stronger opinion by another way, he must not act on the words of his host.