Mark 9:5-6

9:5 So Peter said to Jesus, “Rabbi, it is good for us to be here. Let us make three shelters – one for you, one for Moses, and one for Elijah.” 9:6 (For they were afraid, and he did not know what to say.)

Luke 9:33

9:33 Then as the men were starting to leave, Peter said to Jesus, “Master, it is good for us to be here. Let us make three shelters, one for you and one for Moses and one for Elijah” – not knowing what he was saying.