- Because tefillin need a clean body, the minhag has become not to wear them all day long. Nevertheless, every man must have them on while saying Shema and tefilla. (ShA2)
- If for some reason you didn’t have tefillin then, you are still obligated all day long not to let the day pass without having layed them. (MB6)
- Men of great deeds learn Torah after tefilla with their tefillin on. They must beware of idle speech which also removes their minds from their tefillin. (MB7)
- Nowadays, the minhag is to train boys to lay tefillin two or three months before turning thirteen years old. (MB12)