'Observing' in the Bible

O Jehovah, lead me in Thy righteousness, Because of those observing me, Make straight before me Thy way,

But You Yourself have seen trouble and grief,observing it in order to take the matter into Your hands.The helpless entrusts himself to You;You are a helper of the fatherless.

For observing the festival is a requirement for Israel; it is an ordinance given by the God of Jacob.