Yaakov and Yosef Said Tehillim

Yaakov and Yosef Said Tehillim:
The Medrash (Bereishis Rabbah 68:14) states: “All 20 years that Yaakov was in the house of Lavan, he said Tehillim. The entire time that Yosef was in Mitzrayim, he was busy with Tehillim.”