Musar zu Bereschit 8:8

The Zohar continues: Rabbi Aba and the rest of the company responded, “If we did not set out upon a journey for any reason other than to hear this, it would have been sufficient for us.” While they were walking, a lone dove came to Rabbi Elazar and began chirping to him. Rabbi Elazar said to the dove, “You have always conducted yourself properly in all your missions, as it is written, ‘And Noach sent out the dove’ (Bereishis 8:8). Go tell Rabbi Yose, ‘Look, the companions are coming to see you, myself included. Do not be afraid, for in another three days a miracle will occur. Therefore let him not be overcome with anxiety, for we are coming to him in joy.’” So the dove went on ahead to Rabbi Yose ben Lakonya, Rabbi Elazar’s father-in-law, to fulfill its mission. Then it returned to Rabbi Elazar with the message that Rabbi Yose ben Lakonya was grief-stricken on account of Rabbi Yose ben Peki’in who was on his deathbed. (For at first Rabbi Yose ben Lakonya was ill but afterwards he recovered and Rabbi Yose ben Peki’in became ill in his stead.)