The Amidah (the Standing Prayer(s)), also known as the Shimonei Esrei (18 Benedictions), is a collection of 18 (now 19) prayers said three times a day by Jews all around the world during the moedim (appointed times) of Shacharit (morning prayer), Mincah (afternoon prayer before sundown), and Maariv (evening prayer after sundown) – times that G-d himself desires to meet with us.

It is traditional that at the conclusion of the Amidah, that one insert the prayer of their rabbi. MyJewishLearning.com states:

Although the official structure of the Amidah concludes with the prayer for peace, the Rabbis of antiquity added on private, personal meditations.

Traditionally, Judaism has settled on one particular prayer, that of Mar the son of Rabina as Talmud Berachot 17a states:

Mar the son of Rabina on concluding his prayer added the following: My G-d, keep my tongue
from evil and my lips from speaking guile. May my soul be silent to them that curse me and may my
soul be as the dust to all. Open Thou my heart in Thy law, and may my soul pursue Thy
commandments, and deliver me from evil hap, from the evil impulse and from an evil woman and
from all evils that threaten to come upon the world. As for all that design evil against me, speedily
annul their counsel and frustrate their designs! May the words of my mouth and the meditation of
my heart be acceptable before Thee, O Lord, my rock and my redeemer!

The full prayer after the Amidah found in most Siddurim is:

My G-d, guard my tongue from evil and my lips from speaking deceitfully. To those who curse me, let my soul be silent; and let my soul be like dust to everyone. Open my heart to Your Torah, then my soul will pursue Your commandments. As for all those who oppose me and design evil against me, speedily nullify their counsel and disrupt their design. May it be Your will, Adonai my G-d and the G-d of my forefathers, that human jealousy may not rise up against me, nor my jealousy upon others; may I not become angry today, and may I not anger You. Rescue me from the Evil Inclination, and place in my heart submissiveness and humility. O our King and our G-d, cause Your Name to be unified in Your world; rebuild Your city, lay the foundation of Your House, perfect Your sanctuary; gather in the scattered exiles, redeem Your sheep, and gladden Your congregation. Act for Your Name’s sake; act for Your right hand’s sake; act for Your Torah’s sake; act for Your sanctity’s sake. That Your beloved ones may be given rest; let Your right hand save, and respond to me.

It is a good prayer, and orthodox Messianic Jews will pray this concluding prayer after the Amidah. Personal benedictions may be inserted at this point as well, but typically this prayer is all that is mentioned in this section of the daily prayers in most Siddurim (Jewish prayer books).

Based on this, it is appropriate to insert the Aveinu (the Lord’s Prayer) at this point after the Amdiah, in between “May the expressions of my heart…” and before the conclusion of “…May the expressions of my heart…” and it here within these “bookends,” that the disciples of Yeshua expected him to give them his prayer to be inserted here.

We find in Messianic Jewish writings that the Aveinu was to be included as part of the conclusion to the Amidah (the Standing Prayer(s)), which are prayed three times daily.

Acts 2:42

and they were continuing stedfastly in the teaching of the apostles, and the fellowship, and the breaking of the bread, and the prayers.

Didache 8:2-3

2) Likewise, don’t pray as the hypocrites, but as commanded in the Gospel in this manner:
Our Father in heaven,
Sacred is Your Name.
Your kingdom comes.
Your will is acomplished,
on earth as it is in heaven.
Give us each day our daily bread,
and forgive us our debt
in the manner that we forgive our debtors.
And do not allow us to fall to temptation,
but deliver us from evil,
for Yours is the power and the glory forever.
Amen!

3) Pray in this manner three times per day.

Acts says the followers of Messiah were devoted to the prayers (referring to the Amidah which is prayed three times daily), and the Didache also states that the Aveinu was to be prayed three times daily. These positions are in complete agreement with greater Judaism which teaches that after the Amidah the prayer of one’s rabbi and/or personal benedictions are inserted there as part of one’s daily prayers.

So it is with this that the orthodox Messianic Jewish leadership at JerusalemCouncil.org encourages all followers of Messiah Yeshua to pray the Aveinu after the prayer of Mar ben Rabbina within the concluding “May the expressions” section, which is after the Amidah, three times a day during Shacharit, Mincha, and Maariv.