@YisroelKatz posted on Fri Oct 16, over a year ago
It was indeed necessary for the Torah to write this. For had it not done so, you might have thought to say: Since the idea of honoring one's father and mother is compared by the Torah to the idea of honoring the Omnipresent, for indeed, it is stated here: Honor your father and mother,  and it is stated further on, in another verse: Honor HASHEM with your property;  since these two concepts are compared, it could have been thought that one should therefore listen to [his father] even when his father asks him to transgress a commandment.  [The Torah] therefore informs us that this is not the case; one shoud not listen to him.
איצטריך ס"ד (סלקא דעתך) אמינא הואיל והוקש כיבוד אב ואם לכבודו של מקום שנאמר כאן כבד את אביך ואת אמך ונאמר להלן כבד את ה' מהונך הלכך לציית ליה קמ"ל (קא משמע לן) דלא לשמע ליה
29. Exodus (Shemos) 20:12 שמות כ יב
30. Proverbs (Mishlei) 3:9 משלי ג ט
The word כבד honor, appears in both verses, and they are therefore compared by means of a gezeirah shevah
31. Ritva cites Tosafos as finding difficulty with this assertion of the Gemara. Why would the fact that a comparison exists between the ideas of honoring HASHEM and honoring parents lead us to believe that the obligation to honor parents supersedes the obligation to honor HASHEM! If anything, this comparison might yield that the two have equal standing, but not that one supersedes the other! As a possible solution to this problem, Ritva suggests that perhaps this is exactly what the Gemara means to say. In other words, perhaps when the Gemara considers that the command to honor parents might "push aside" the command to return an object, it means only that the two would have equal standing, in which case the son would be permitted to choose which command he
wishes to fulfill (cf. Tos. 'תוס HaRosh הראש).
איש אמו ואביו תיראו ואת שבתותי תשמרו אני ה' כולכם חייבין בכבודי
ויקרא יט ג
[EVERY] MAN, YOU SHALL REVERE YOUR MOTHER AND FATHER, AND MY SABBATH YOU SHALL OBSERVE, I AM HASHEM, ALL OF YOU ARE OBLIGATED TO UPHOLD MY HONOR.
LEVITICUS (VAYIKRA) 19:3
בבא מציעא לב
Bava Metzia 32