Why was the divine command to "Be patient" ( اصطبر ) used instead of "Be patient" ( اصبر ) in Surat Maryam, Ayah 65?

There is no difference between "isbir" (be patient) and "istabir" (be very patient) in their fundamental meaning; both are commands to be patient. However, "istabir" is more emphatic in meaning, and it might be understood to emphasize the command to be patient in worship due to its difficulty. Al-Baydawi clarifies that the verse means to approach worship with diligence and persevere in it despite hardships.