What does Tehillim 20 mean?
Tehillim (Psalm) 20, known by its opening words Lamnatzeach mizmor l'David, is a short tefillah that Hashem answer a person b'yom tzarah — on a day of distress. Its central pasuk (20:2) reads "Ya'ancha Hashem b'yom tzarah, yesagevcha shem Elokei Yaakov" — "May Hashem answer you on a day of distress; may the Name of the God of Yaakov set you on high."
The kapitel's defining line (20:8) contrasts those who trust "in chariots and in horses" with "va'anachnu b'shem Hashem Elokeinu nazkir" — "but we invoke the Name of Hashem" — which gives it its traditional association with going out toward danger. By widespread custom it is said in the weekday morning davening and omitted on certain days that have a character of simcha (no Tachanun). Read the full page on Tehillim 20 →
What does Tehillim 121 mean?
Tehillim (Psalm) 121 is a shir lamaalos about Hashem as the Shomer — the Guardian who never sleeps. It opens "esa einai el he-harim, me-ayin yavo ezri" ("I lift my eyes to the mountains — from where will my help come?") and answers that help comes from Hashem alone. Its defining pasuk (121:4): "Hinei lo yanum v'lo yishan shomer Yisrael" — "Behold, the Guardian of Israel neither slumbers nor sleeps."
The perek closes (121:8) with "Hashem yishmor tzeischa u-voecha" — "Hashem will guard your going out and your coming in." On the strength of that guarding theme, many have the minhag to say Tehillim 121 as a tefillah for protection and before or during travel — a well-attested custom, not a halacha the pesukim prescribe. Read the full page on Tehillim 121 →
Which Tehillim do you say for a yeshuah?
There is no single kapitel the Torah prescribes "for a yeshuah" — saying Tehillim in a time of need is a well-established and ancient minhag, not a halacha with one mandated list. Many turn to Tehillim 20 and Tehillim 121, whose plain meaning is a prayer to be answered and protected, but which perakim a community says varies. Treat any list as custom, and for psak ask your rav.
The custom of crying out to Hashem in words has long been joined to acting on those words through tzedakah — one well-known form is giving b'zechus Rabbi Meir Baal Haness while davening for a yeshuah. Tefillah voices the need; tzedakah turns it into a deed offered alongside the perakim. The honest guide to Tehillim for a yeshuah →
Is a perek of Tehillim a guaranteed segulah?
No. A perek of Tehillim is a heartfelt tefillah, not an amulet that mechanically guarantees an outcome. No "say it this many times and the result is assured" formula appears in the text. The Rambam (Hilchos Avodah Zarah 11:12) forbids treating Torah verses as a physical cure, yet permits a healthy person to read verses and chapters of Tehillim so that the merit of reading them protects him. Say Tehillim with a full heart and bitachon; the answer is in Hashem's hands.
This is a neutral reference to the plain meaning of Tehillim and the custom of saying them. Customs vary by community and this is not a substitute for a rav — for any halachic question, ask your rav.