a certain day # 58_HEB_04_07 # Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts. 
a certain day # 42_LUK_05_17 # And it came to pass on a certain day, as he was teaching, that there were Pharisees and doctors of the law sitting by, which were come out of every town of Galilee, and Judaea, and Jerusalem: and the power of the Lord was [present] to heal them. 
a certain day # 42_LUK_08_22 # Now it came to pass on a certain day, that he went into a ship with his disciples: and he said unto them, Let us go over unto the other side of the lake. And they launched forth.