Is the sitting of rest recommended?

Our brothers are also asking and saying: Is the moment of tranquility after the second prostration when rising to the second or fourth rak'ah a necessity of the Sunnah of our Master (peace and blessings be upon him)?
Answer: This is a sitting called the sitting of rest, after the first and after the third. It is after the first in every prayer, and after the third in the four-rak'ah prayer. The Prophet (peace and blessings be upon him), when he rose from the first prostration of the first rak'ah and from the second prostration of the third rak'ah, would sit for a short time, like his sitting between the two prostrations, and then rise. This is the predominant of his actions (peace and blessings be upon him), and he sometimes left it. This indicates that it is recommended and a Sunnah, and not obligatory. There is no dhikr or du'a' in it, but rather a light sitting, and then he rises to the second and to the fourth. Yes.