φυλακτήριον

From the study of Matthew 23:5

Range of meaning

In general Greek: a guard-post or fortification; a safeguard or means of protection; and very often an amulet, a charm worn to ward off harm (BDAG). In Jewish use, as here, it is the Greek name for tefillin. These are small leather capsules holding handwritten Torah passages (in rabbinic practice Exod 13:1–10, 11–16; Deut 6:4–9; 11:13–21), bound with leather straps on the forehead and the arm.

Against the English

'Phylactery' simply carries the Greek word over into English, so most readers do not know what it is. NLT's 'prayer boxes with Scripture verses inside' explains the object but adds 'prayer', which is a later framing and not in the Greek. The Hebrew name, tefillin, is linked to the word for prayer, but that name is attested only later, in rabbinic literature. Earlier texts speak of 'signs' and ṭoṭafot (Deut 6:8).

How it drifted

Few English readers know the object, and some guess it is a charm or a purely Pharisaic invention. In fact it comes from a literal reading of Deut 6:8 / 11:18 ('bind them as a sign on your hand… between your eyes'). Jews well beyond the Pharisees practised it.

Used elsewhere in the period

Actual tefillin cases and their parchment slips were found at Qumran and other Judean desert sites, from roughly the 1st century BC to the 1st century AD (published by Yadin and by Milik in DJD). The cases are very small, often well under 2 cm across. Some Qumran slips contain the Ten Commandments and other passages beyond the later rabbinic four. Josephus (Antiquities 4.213) and the Letter of Aristeas (§159) both describe the practice. The Mishnah regulates their making (e.g. m. Menahot 3:7; m. Megillah 4:8). Why Greek-speaking Jews used φυλακτήριον is debated (see debates). Its common meaning 'amulet' may reflect a protective understanding, or simply 'something that guards' the commandments in memory.