The believers in the Savior's day shouted Hosanna to welcome the Savior into Jerusalem and to testify of Him. The early saints perform a Solemn Assembly, including a Hosanna Shout, to dedicate the Kirtland temple. What can you and I do to "dedicate" ourselves to the Lord and invite Him into our lives?
Pres. Nelson
https://www.churchofjesuschrist.org/study/general-conference/2017/04/drawing-the-power-of-jesus-christ-into-our-lives?lang=eng
Elder Renlund
https://www.churchofjesuschrist.org/study/general-conference/2016/10/repentance-a-joyful-choice?lang=eng