Auxiliary verb THVRA

entry for the word in De Haan-Hettema prov. dictionary 1832 ~ assuming OLB would be a 19th century creation, one would expect the varieties in it more to resemble those as suggested in the contemporary dictionaries

in Richthofen dictionary 1840

In previous posts we have taken a closer look at the auxiliary verbs most frequently used in the defined samples. Now it is time for the next in line: THVRA (modern cognates English - dare, German - dürfen*, Dutch - durven, Frisian - doarre, Swedish - tordas, Danish - turde, Icelandic - þora, Norse - tore).
*German 'dürfen' has a different meaning than the other cognates: to be allowed. While 'to dare' could be interpreted as 'to allow oneself', in the German word the one or the thing that allows lies outside of the self.

a. THVRA present

FRYAS	English	German	Dutch	Frisian
IK THVR (1)	all conjug.:	ich darf	ik durf	ik doar
THV THVRATH (1)*	dare	du darfst	2nd / 3rd p.:	do doarst
ER -		er darf	durft	hy doar(t)
WI THVRA (1)		wir dürfen	plur.:	plur.:
J -		ihr dürft	durven	doar(r)e
HJA -		sie dürfen

* Considering the conjugations of the other verbs, examined so far, 2nd person sing. present would be expected to end -ST (for example THVRST, THVREST).

b. THVRA past

FRYAS	English	German	Dutch	Frisian
IK -	all conjug.:	ich durfte	sing.:	ik doarst
THV -	dared	du durftest	durfde	do doarst(e)
ER THVRADE (6)*		er durfte		hy doarst
WI -		wir durften	plur.:	plur.:
J -		ihr durftet	durfden	doarsten
HJA THVRADON (5)		sie durften

* Also 1x THURADE, 1x THURVATH

Used in negative: 13 out of 16 = 81%.

Fragments in the Oera Linda-book (not only the samples)

1 [00b/12] B. Liko
THRVCHDA WI HJARA LJUDA TO SPRÉKE THVRA

2 [037/25] 4d. Minno
THÉRTHRVCH NE THVRADON HJA NÉN STRID WITHER AN TO SPINNANDE.

3 [047/21] 7a. all burgs
HWÉRTHRVCH THÀT FINDAS FOLK NAVT KVMA NE THVRADON.

4 [055/14] 8b1. Treasureburg
MEN LIK EN TWÍRNEWIND WENDON HJA OMME ÀND NE THVRADON NA WITHER FORSKINA.

5 [055/21] 8b1. Treasureburg
THAT I FRYA ÀND WRALDAS GÁST MISKÀNA ÀND SPOTA THVRADE.

6 [079/17] 11a. all burgs
WR A BERGA ÀND WR N SÉ NE THVRADE HI NAVT NE KVMA.

7 [122/25] 14d1. Liudgeart 1
THA HI NE THVRADE SIN TOCHT NAVT VRFATA.

8 [126/11] 14d2. Liudgeart 1
THJU MODER NE THVRADE HJRA JOI NAVT WACHTJA.

9 [126/18] 14d2. Liudgeart 1
THRVCHDAM HJU HJRA MAN NAVT WACHTJA THURADE.

10 [128/02] 14d2. Liudgeart 1
HJUD NE KV NI THVRADE NINMAN NE BILÍWA.

11 [136/31] 15b2. Dela-Hellenia
MEN HJA NE THVRADON HIM NAVT AVBÉR BIKÀNÁ AS HJARA ÀJNE BLOD.

12 [151/22] 16b2. Konered
ASTE THVRATH THENE MÉNA FJAND TO BIKÀMPANE

13 [154/03] 16b2. Konered
THACH JEF WI THÉRTHRVCH BÉTER WRDE THVR IK NAVT BIJECHTA.

14 [164/12] 16d. Liudgeart 2
THÉRVMBE NE THURVATH SE FAR HJARA SÉK NIT ÔPENTLIK UT NI KVMA.

15 [198/04] 19a. unknown about Askar
THA RIKA NE THVRADON HJARA MULA NAVT ÉPEN NE DVA.

16 [206/28] 19d. unknown about Askar
SÁ THAT THÉR AFTERNÉI NÉN MÀNNISK MÁRA KVMA NE THVRADE.

noun derived from the verb:
INNER WINNA JEFTHA MINNA MÔNATH GVNG AIDER THURVAR (one who dares) WITHER HÉMFÁRA.