Gwahoddiad was originally the English hymn

Hymn

A hymn is a type of song, usually religious, specifically written for the purpose of praise, adoration or prayer, and typically addressed to a deity or deities, or to a prominent figure or personification...

 "I hear thy welcome voice", the words and tune of which were written in 1872 by the American Methodist minister and hymn writer Lewis Hartsough (1828-1919), during a re­viv­al meet­ing at Epworth, Iowa

Epworth, Iowa

Epworth is a city in Dubuque County, Iowa, United States. It is part of the Dubuque, Iowa Metropolitan Statistical Area. The population was 1,428 at the 2000 census, but is now estimated to be 1,589 ....

 where Hartsough was Pastor. Hartsough was music editor of The Revivalist, first published in Troy, New York

Troy, New York

Troy is a city in the US State of New York and the seat of Rensselaer County. Troy is located on the western edge of Rensselaer County and on the eastern bank of the Hudson River. Troy has close ties to the nearby cities of Albany and Schenectady, forming a region popularly called the Capital...

 in 1868 and revised in 1872.

The Welsh version Gwahoddiad, written by Calvinistic Methodist minister and musician Rev. John Roberts (Ieuan Gwyllt), has become so well-known in translation that many people believe it to be a traditional Welsh

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

hymn.

Welsh

"Gwahoddiad"

Mi glywaf dyner lais,

Yn galw arnaf fi,

I ddod a golchi 'meiau gyd.

Yn afon Calfari.

Byrdwn

Arglwydd, dyma fi

Ar dy alwad di,

Golch fi burlan yn a gwaed

A gaed ar Galfari.

Yr Iesu sy'n fy ngwadd,

I dderbyn gyda'i saint,

Ffydd, gobaith, cariad pur a hedd,

A phob rhyw nefol fraint.

Yr Iesu sy'n cryfhau,

O'm mewn Ei waith trwy ras;

Mae'n rhoddi nerth i'm henaid gwan,

I faeddu 'mhechod cas.

Gogoniant byth am drefn,

Y cymod a'r glanhad;

Derbyniaf Iesu fel yr wyf,

A chanaf am y gwaed.

English

"Invitation"

I hear thy gentle voice

Calling to me

To come and wash all my sins

In the river of Calvary.

Chorus:

Lord, here I am

At thy call,

Bleach my soul in the blood

Which flowed on Calvary.

It is Jesus who invites me

To receive with his saints

Faith, hope, pure love and peace

And every heavenly privilege.

It is Jesus who strengthens

Me in his work through grace;

He gives strength to my weak soul

To beat my hateful sins.

Glory ever for ordering

The reconciliation and the expurgation;

I will receive Jesus as I am

And sing about the blood.