What is the significance of "Shalosh 'Regalim'"?
Rashi, Targum Onkelos and Targum Yonasan: It means three times a year. 1
Torah Temimah (citing Chagigah): It means foot-festivals, which obligates one to go up to the Beis-ha'Mikdash on foot. 2
Hence someone who is lame (even) in one leg is Patur from Aliyas ha'Regel, as is a child who is too small to hold his father's hand and ascend Har ha'Bayis together with him (Chagigah, 2a, 3a, respectively). Indeed, this explains why the Mitzvah is referred to as 'Aliyas ha'Regel'.
What are the connotations of the words "Tachog Li"?