This is what the verse said: “For they are a graceful adornment for your head [roshekha]” (Proverbs 1:9) – the Rabbis said: Matters of Torah are grace for your infirmity [rashiyutekha]. How so? A learned person, when he grows old, everyone [still] comes and surrounds him and asks him about matters of Torah. Another interpretation, what is “for they are a graceful adornment [livyat] for your head”?
Rabbi Pinḥas bar Ḥama said: Wherever you go, mitzvot accompany [melavot] you. “If you build a new house, you shall make a parapet for your roof” (Deuteronomy 22:8). If you install a door for yourself, mitzvot accompany you, as it is stated: “You shall write them on the doorposts of your house” (Deuteronomy 6:9). If you don new garments, mitzvot accompany you, as it is stated: “You shall not wear a mixture of fibers” (Deuteronomy 22:11).
If you go to cut your hair, mitzvot accompany you, as it is stated: “You shall not round the edge of your head” (Leviticus 19:27). If you have a field and go to plow in it, mitzvot accompany you, as it is stated: “You shall not plow with an ox and a donkey together” (Deuteronomy 22:10). If you sow it, mitzvot accompany you, as is stated: “You shall not sow your vineyard with diverse kinds” (Deuteronomy 22:9).
If you reap it, mitzvot accompany you, as it is stated: “When you reap your harvest in your field, and you forget a sheaf in the field, [you shall not return to take it]” (Deuteronomy 24:19). The Holy One blessed be He said, [moreover]: ‘Even when you are not occupied with any activity at all, but are [simply] walking on the road, mitzvot accompany you.’ From where is this derived? It is as it is stated: “If a bird's nest will happen before you.”