Tzitzit is one of the most visible expressions of Torah observance within Jewish and Messianic communities.  The details of this mitzvah are often the topic of debate and discussion among Messianic believers.
When we are encouraged by others in our congregations to do something or to believe something in regards to Scripture, we should always be like the Bereans and test everything against Scripture itself (Acts 17:11)... the whole of Scripture (2 Timothy 3:16-17).  If a person feels "led by the spirit" to speak, behave, or believe a certain way, they should test that spirit (1 John 4:1) and see if what that spirit says is in agreement with Scripture.
 
Tzitzit
Hebrew
The Hebrew word ציצת (tzitzit- Strong's #6734) is found only four times in three verses of the Tanakh.
The first, second, and third use of tzitzit are found in Numbers 15 where a commandment is given to the sons of Israel:
 
The wearing of tzit-tzit is a commandment given in Numbers 15:37-41 and is repeated in Deut 22:12. We also read about it in the Apostolic writings. YHVH gave this commandment to wear tzit-tzit and to look at it, as a reminder to us to do all His commandments and be set apart to Him. In this study, we will explore this commandment a bit to see how we are to understand and apply this in our lives. It may seem insignificant, but it is not. It may seem like one of the least of YHVH’s commandments, but it is very important.