There are several reasons why we have to research and study the Word of Yah. Here I give the Scriptural reasons I have found so far why we have to study His Word.
Our duty, which is given to us by Elohim, is to search out all that has been done under the shamayim to be humbled by it (Ecclesiastes 1:13). Like noble Bereans we are to receive the Word with great eagerness, and search the Scriptures daily (Acts 17:11) to prove all things, and hold fast to that which is good (1 Thessalonians 1 5:21). We are to do our utmost to present ourselves approved unto Elohim. A worker who does not need to be ashamed, rightly handling the Word of Truth (2 Timothy 2 2:15), and to work out our own deliverance with fear and trembling (2 Phillipians 2 2:12). Be steadfast, immovable, always excelling in the work of the Master, knowing that your labor is not in vain in the Master (1 Corinthians15:58). For the Word of Elohim is living, and working, and sharper than any two-edged sword, cutting even to the dividing of being and spirit, and of joints and marrow, and able to judge the thoughts and intentions of the heart (Hebrews 4:12). All Scripture is breathed out by Yahuah and profitable for teaching, for reproof, for setting straight, for instruction in righteousness, that the man of Elohim might be fitted, equipped for every good work (2 Timothy 2 3:16-17).
Yahuah will reward the ones who will diligently seek Him (Hebrews 11:6). Yahuah does not make it difficult (1 John 5:3). For it is: command upon command, command upon command, line upon line, line upon line, here a little, there a little (Isaiah 28:10). The Ruach of Truth guides you into all truth (1 John 16:13). We are to seek Him and draw near to Him before He draws near to us (James 4:8). We have to call on Him, and pray to Him and He shall listen. We have to seek Him, and we shall find Him when we search for Him with all our heart (Jeremiah 29:12-13). The whole duty of mankind is to Fear Yahuah and obey His commands (Ecclesiastes 12:13).