Exodus 35:21נָדְבָה
And everyone whose heart stirred him and whose spirit prompted him came and brought an offering to the LORD for the work on the Tent of Meeting, for all its services, and for the holy garments.
Judges 5:2בְּהִתְנַדֵּב
“When the princes take the lead in Israel, when the people volunteer, bless the LORD.
1 Chronicles 29:14לְהִתְנַדֵּב
But who am I, and who are my people, that we should be able to give as generously as this? For everything comes from You, and from Your own hand we have given to You.
2 Chronicles 17:16הַמִּתְנַדֵּב
and next to him, Amasiah son of Zichri, the volunteer for the LORD, and with him 200,000 mighty men of valor.
Ezra 1:6הִתְנַדֵּב ס
And all their neighbors supported them with articles of silver and gold, with goods and livestock, and with valuables, in addition to all their freewill offerings.
Nehemiah 11:2הַמִּתְנַדְּבִים
And the people blessed all the men who volunteered to live in Jerusalem.

Brown-Driver-Briggs

נָדַב vb. incite, impel

Qal whose heart incited

Hithp.

1. volunteer

2. offer free-will-offerings

Sources: Brown-Driver-Briggs (1906, public domain) from the Open Scriptures Hebrew Lexicon (CC BY 4.0), glosses from STEPBible TBESH (CC BY 4.0); STEPBible TAHOT (Hebrew Bible, Leningrad Codex, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.